diff --git a/src/index.ts b/src/index.ts
index 3e0a819..12bb879 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -43,7 +43,9 @@ export = (app: Probot) => {
     const shouldReviewReadyAPIPR =
       action === 'ready_for_review' && pr.labels.some(({ id }) => hasAPILabel(id));
 
-    if (shouldReviewReadyAPIPR || shouldReviewNewAPIPR) {
+    const isDecember = new Date(payload.pull_request.updated_at).getMonth() === 11;
+
+    if (!isDecember && (shouldReviewReadyAPIPR || shouldReviewNewAPIPR)) {
       await postToSlack(pr);
     }
   });
diff --git a/test/fixtures/pull_request.labeled.december.json b/test/fixtures/pull_request.labeled.december.json
new file mode 100644
index 0000000..0a1fdf6
--- /dev/null
+++ b/test/fixtures/pull_request.labeled.december.json
@@ -0,0 +1,690 @@
+{
+  "action": "labeled",
+  "number": 38982,
+  "pull_request": {
+    "url": "https://api.github.com/repos/electron/electron/pulls/38982",
+    "id": 1419246452,
+    "node_id": "PR_kwDOAI8xS85Ul_t0",
+    "html_url": "https://github.com/electron/electron/pull/38982",
+    "diff_url": "https://github.com/electron/electron/pull/38982.diff",
+    "patch_url": "https://github.com/electron/electron/pull/38982.patch",
+    "issue_url": "https://api.github.com/repos/electron/electron/issues/38982",
+    "number": 38982,
+    "state": "open",
+    "locked": false,
+    "title": "feat: add `BrowserWindow.isOccluded()`",
+    "user": {
+      "login": "codebytere",
+      "id": 2036040,
+      "node_id": "MDQ6VXNlcjIwMzYwNDA=",
+      "avatar_url": "https://avatars.githubusercontent.com/u/2036040?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/codebytere",
+      "html_url": "https://github.com/codebytere",
+      "followers_url": "https://api.github.com/users/codebytere/followers",
+      "following_url": "https://api.github.com/users/codebytere/following{/other_user}",
+      "gists_url": "https://api.github.com/users/codebytere/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/codebytere/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/codebytere/subscriptions",
+      "organizations_url": "https://api.github.com/users/codebytere/orgs",
+      "repos_url": "https://api.github.com/users/codebytere/repos",
+      "events_url": "https://api.github.com/users/codebytere/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/codebytere/received_events",
+      "type": "User",
+      "site_admin": false
+    },
+    "body": "#### Description of Change\r\n\r\nCloses https://github.com/electron/electron/issues/38955.\r\n\r\nWe've historically not been consistent in our implementations of `BrowserWindow.isVisible()` and similar methods how occlusion affects return values. I believe instead it might be more effective to add in a separate method for apps to check occlusion status.\r\n\r\nThis also removes the occlusion check from the macOS implementation of `BrowserWindow.isVisible()`, which was broken and not being properly accounted for.\r\n\r\n#### Checklist\r\n<!-- Remove items that do not apply. For completed items, change [ ] to [x]. -->\r\n\r\n- [x] PR description included and stakeholders cc'd\r\n- [x] `npm test` passes\r\n- [x] tests are [changed or added](https://github.com/electron/electron/blob/main/docs/development/testing.md)\r\n- [x] [PR release notes](https://github.com/electron/clerk/blob/main/README.md) describe the change in a way relevant to app developers, and are [capitalized, punctuated, and past tense](https://github.com/electron/clerk/blob/main/README.md#examples).\r\n\r\n#### Release Notes\r\n\r\nNotes: Added a new method `BrowserWindow.isOccluded()` to allow apps to check occlusion status.",
+    "created_at": "2023-12-04T08:52:02Z",
+    "updated_at": "2023-12-24T12:33:31Z",
+    "closed_at": null,
+    "merged_at": null,
+    "merge_commit_sha": "eb1a1aded93c9ef04ac81e7bfda6277db73212a7",
+    "assignee": null,
+    "assignees": [],
+    "requested_reviewers": [
+      {
+        "login": "jkleinsc",
+        "id": 609052,
+        "node_id": "MDQ6VXNlcjYwOTA1Mg==",
+        "avatar_url": "https://avatars.githubusercontent.com/u/609052?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/jkleinsc",
+        "html_url": "https://github.com/jkleinsc",
+        "followers_url": "https://api.github.com/users/jkleinsc/followers",
+        "following_url": "https://api.github.com/users/jkleinsc/following{/other_user}",
+        "gists_url": "https://api.github.com/users/jkleinsc/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/jkleinsc/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/jkleinsc/subscriptions",
+        "organizations_url": "https://api.github.com/users/jkleinsc/orgs",
+        "repos_url": "https://api.github.com/users/jkleinsc/repos",
+        "events_url": "https://api.github.com/users/jkleinsc/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/jkleinsc/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      {
+        "login": "zcbenz",
+        "id": 639601,
+        "node_id": "MDQ6VXNlcjYzOTYwMQ==",
+        "avatar_url": "https://avatars.githubusercontent.com/u/639601?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/zcbenz",
+        "html_url": "https://github.com/zcbenz",
+        "followers_url": "https://api.github.com/users/zcbenz/followers",
+        "following_url": "https://api.github.com/users/zcbenz/following{/other_user}",
+        "gists_url": "https://api.github.com/users/zcbenz/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/zcbenz/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/zcbenz/subscriptions",
+        "organizations_url": "https://api.github.com/users/zcbenz/orgs",
+        "repos_url": "https://api.github.com/users/zcbenz/repos",
+        "events_url": "https://api.github.com/users/zcbenz/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/zcbenz/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      {
+        "login": "miniak",
+        "id": 1281234,
+        "node_id": "MDQ6VXNlcjEyODEyMzQ=",
+        "avatar_url": "https://avatars.githubusercontent.com/u/1281234?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/miniak",
+        "html_url": "https://github.com/miniak",
+        "followers_url": "https://api.github.com/users/miniak/followers",
+        "following_url": "https://api.github.com/users/miniak/following{/other_user}",
+        "gists_url": "https://api.github.com/users/miniak/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/miniak/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/miniak/subscriptions",
+        "organizations_url": "https://api.github.com/users/miniak/orgs",
+        "repos_url": "https://api.github.com/users/miniak/repos",
+        "events_url": "https://api.github.com/users/miniak/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/miniak/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      {
+        "login": "VerteDinde",
+        "id": 4624411,
+        "node_id": "MDQ6VXNlcjQ2MjQ0MTE=",
+        "avatar_url": "https://avatars.githubusercontent.com/u/4624411?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/VerteDinde",
+        "html_url": "https://github.com/VerteDinde",
+        "followers_url": "https://api.github.com/users/VerteDinde/followers",
+        "following_url": "https://api.github.com/users/VerteDinde/following{/other_user}",
+        "gists_url": "https://api.github.com/users/VerteDinde/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/VerteDinde/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/VerteDinde/subscriptions",
+        "organizations_url": "https://api.github.com/users/VerteDinde/orgs",
+        "repos_url": "https://api.github.com/users/VerteDinde/repos",
+        "events_url": "https://api.github.com/users/VerteDinde/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/VerteDinde/received_events",
+        "type": "User",
+        "site_admin": false
+      }
+    ],
+    "requested_teams": [],
+    "labels": [
+      {
+        "id": 1034512799,
+        "node_id": "MDU6TGFiZWwxMDM0NTEyNzk5",
+        "url": "https://api.github.com/repos/electron/electron/labels/semver/patch",
+        "name": "semver/patch",
+        "color": "6ac2dd",
+        "default": false,
+        "description": "backwards-compatible bug fixes"
+      },
+      {
+        "id": 1243058793,
+        "node_id": "MDU6TGFiZWwxMjQzMDU4Nzkz",
+        "url": "https://api.github.com/repos/electron/electron/labels/new-pr%20%F0%9F%8C%B1",
+        "name": "new-pr 🌱",
+        "color": "8af297",
+        "default": false,
+        "description": "PR opened in the last 24 hours"
+      },
+      {
+        "id": 5135796091,
+        "node_id": "LA_kwDOAI8xS88AAAABMh4Hew",
+        "url": "https://api.github.com/repos/electron/electron/labels/target/24-x-y",
+        "name": "target/24-x-y",
+        "color": "ad244f",
+        "default": false,
+        "description": "PR should also be added to the \"24-x-y\" branch."
+      },
+      {
+        "id": 5358528181,
+        "node_id": "LA_kwDOAI8xS88AAAABP2SmtQ",
+        "url": "https://api.github.com/repos/electron/electron/labels/target/25-x-y",
+        "name": "target/25-x-y",
+        "color": "ad244f",
+        "default": false,
+        "description": "PR should also be added to the \"25-x-y\" branch."
+      },
+      {
+        "id": 5566791473,
+        "node_id": "LA_kwDOAI8xS88AAAABS85_MQ",
+        "url": "https://api.github.com/repos/electron/electron/labels/target/26-x-y",
+        "name": "target/26-x-y",
+        "color": "ad244f",
+        "default": false,
+        "description": "PR should also be added to the \"26-x-y\" branch."
+      }
+    ],
+    "milestone": null,
+    "draft": false,
+    "commits_url": "https://api.github.com/repos/electron/electron/pulls/38982/commits",
+    "review_comments_url": "https://api.github.com/repos/electron/electron/pulls/38982/comments",
+    "review_comment_url": "https://api.github.com/repos/electron/electron/pulls/comments{/number}",
+    "comments_url": "https://api.github.com/repos/electron/electron/issues/38982/comments",
+    "statuses_url": "https://api.github.com/repos/electron/electron/statuses/759f1e84af46b7feddf973be4b63ae29ff98a7bf",
+    "head": {
+      "label": "electron:fix-is-visible-check",
+      "ref": "fix-is-visible-check",
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+        "avatar_url": "https://avatars.githubusercontent.com/u/13409222?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/electron",
+        "html_url": "https://github.com/electron",
+        "followers_url": "https://api.github.com/users/electron/followers",
+        "following_url": "https://api.github.com/users/electron/following{/other_user}",
+        "gists_url": "https://api.github.com/users/electron/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/electron/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/electron/subscriptions",
+        "organizations_url": "https://api.github.com/users/electron/orgs",
+        "repos_url": "https://api.github.com/users/electron/repos",
+        "events_url": "https://api.github.com/users/electron/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/electron/received_events",
+        "type": "Organization",
+        "site_admin": false
+      },
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+        "node_id": "MDEwOlJlcG9zaXRvcnk5Mzg0MjY3",
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+          "url": "https://api.github.com/users/electron",
+          "html_url": "https://github.com/electron",
+          "followers_url": "https://api.github.com/users/electron/followers",
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+          "gists_url": "https://api.github.com/users/electron/gists{/gist_id}",
+          "starred_url": "https://api.github.com/users/electron/starred{/owner}{/repo}",
+          "subscriptions_url": "https://api.github.com/users/electron/subscriptions",
+          "organizations_url": "https://api.github.com/users/electron/orgs",
+          "repos_url": "https://api.github.com/users/electron/repos",
+          "events_url": "https://api.github.com/users/electron/events{/privacy}",
+          "received_events_url": "https://api.github.com/users/electron/received_events",
+          "type": "Organization",
+          "site_admin": false
+        },
+        "html_url": "https://github.com/electron/electron",
+        "description": ":electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS",
+        "fork": false,
+        "url": "https://api.github.com/repos/electron/electron",
+        "forks_url": "https://api.github.com/repos/electron/electron/forks",
+        "keys_url": "https://api.github.com/repos/electron/electron/keys{/key_id}",
+        "collaborators_url": "https://api.github.com/repos/electron/electron/collaborators{/collaborator}",
+        "teams_url": "https://api.github.com/repos/electron/electron/teams",
+        "hooks_url": "https://api.github.com/repos/electron/electron/hooks",
+        "issue_events_url": "https://api.github.com/repos/electron/electron/issues/events{/number}",
+        "events_url": "https://api.github.com/repos/electron/electron/events",
+        "assignees_url": "https://api.github.com/repos/electron/electron/assignees{/user}",
+        "branches_url": "https://api.github.com/repos/electron/electron/branches{/branch}",
+        "tags_url": "https://api.github.com/repos/electron/electron/tags",
+        "blobs_url": "https://api.github.com/repos/electron/electron/git/blobs{/sha}",
+        "git_tags_url": "https://api.github.com/repos/electron/electron/git/tags{/sha}",
+        "git_refs_url": "https://api.github.com/repos/electron/electron/git/refs{/sha}",
+        "trees_url": "https://api.github.com/repos/electron/electron/git/trees{/sha}",
+        "statuses_url": "https://api.github.com/repos/electron/electron/statuses/{sha}",
+        "languages_url": "https://api.github.com/repos/electron/electron/languages",
+        "stargazers_url": "https://api.github.com/repos/electron/electron/stargazers",
+        "contributors_url": "https://api.github.com/repos/electron/electron/contributors",
+        "subscribers_url": "https://api.github.com/repos/electron/electron/subscribers",
+        "subscription_url": "https://api.github.com/repos/electron/electron/subscription",
+        "commits_url": "https://api.github.com/repos/electron/electron/commits{/sha}",
+        "git_commits_url": "https://api.github.com/repos/electron/electron/git/commits{/sha}",
+        "comments_url": "https://api.github.com/repos/electron/electron/comments{/number}",
+        "issue_comment_url": "https://api.github.com/repos/electron/electron/issues/comments{/number}",
+        "contents_url": "https://api.github.com/repos/electron/electron/contents/{+path}",
+        "compare_url": "https://api.github.com/repos/electron/electron/compare/{base}...{head}",
+        "merges_url": "https://api.github.com/repos/electron/electron/merges",
+        "archive_url": "https://api.github.com/repos/electron/electron/{archive_format}{/ref}",
+        "downloads_url": "https://api.github.com/repos/electron/electron/downloads",
+        "issues_url": "https://api.github.com/repos/electron/electron/issues{/number}",
+        "pulls_url": "https://api.github.com/repos/electron/electron/pulls{/number}",
+        "milestones_url": "https://api.github.com/repos/electron/electron/milestones{/number}",
+        "notifications_url": "https://api.github.com/repos/electron/electron/notifications{?since,all,participating}",
+        "labels_url": "https://api.github.com/repos/electron/electron/labels{/name}",
+        "releases_url": "https://api.github.com/repos/electron/electron/releases{/id}",
+        "deployments_url": "https://api.github.com/repos/electron/electron/deployments",
+        "created_at": "2013-04-12T01:47:36Z",
+        "updated_at": "2023-12-24T11:44:05Z",
+        "pushed_at": "2023-07-24T12:32:11Z",
+        "git_url": "git://github.com/electron/electron.git",
+        "ssh_url": "git@github.com:electron/electron.git",
+        "clone_url": "https://github.com/electron/electron.git",
+        "svn_url": "https://github.com/electron/electron",
+        "homepage": "https://electronjs.org",
+        "size": 133983,
+        "stargazers_count": 108314,
+        "watchers_count": 108314,
+        "language": "C++",
+        "has_issues": true,
+        "has_projects": true,
+        "has_downloads": true,
+        "has_wiki": false,
+        "has_pages": false,
+        "has_discussions": false,
+        "forks_count": 14855,
+        "mirror_url": null,
+        "archived": false,
+        "disabled": false,
+        "open_issues_count": 926,
+        "license": {
+          "key": "mit",
+          "name": "MIT License",
+          "spdx_id": "MIT",
+          "url": "https://api.github.com/licenses/mit",
+          "node_id": "MDc6TGljZW5zZTEz"
+        },
+        "allow_forking": true,
+        "is_template": false,
+        "web_commit_signoff_required": false,
+        "topics": [
+          "c-plus-plus",
+          "chrome",
+          "css",
+          "electron",
+          "html",
+          "javascript",
+          "nodejs",
+          "v8",
+          "works-with-codespaces"
+        ],
+        "visibility": "public",
+        "forks": 14855,
+        "open_issues": 926,
+        "watchers": 108314,
+        "default_branch": "main",
+        "allow_squash_merge": true,
+        "allow_merge_commit": false,
+        "allow_rebase_merge": false,
+        "allow_auto_merge": false,
+        "delete_branch_on_merge": true,
+        "allow_update_branch": false,
+        "use_squash_pr_title_as_default": true,
+        "squash_merge_commit_message": "COMMIT_MESSAGES",
+        "squash_merge_commit_title": "PR_TITLE",
+        "merge_commit_message": "PR_TITLE",
+        "merge_commit_title": "MERGE_MESSAGE"
+      }
+    },
+    "base": {
+      "label": "electron:main",
+      "ref": "main",
+      "sha": "09e6e4b9a7862416e1ac8e45d94c17b015a80165",
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+        "node_id": "MDEwOlJlcG9zaXRvcnk5Mzg0MjY3",
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+        "html_url": "https://github.com/electron/electron",
+        "description": ":electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS",
+        "fork": false,
+        "url": "https://api.github.com/repos/electron/electron",
+        "forks_url": "https://api.github.com/repos/electron/electron/forks",
+        "keys_url": "https://api.github.com/repos/electron/electron/keys{/key_id}",
+        "collaborators_url": "https://api.github.com/repos/electron/electron/collaborators{/collaborator}",
+        "teams_url": "https://api.github.com/repos/electron/electron/teams",
+        "hooks_url": "https://api.github.com/repos/electron/electron/hooks",
+        "issue_events_url": "https://api.github.com/repos/electron/electron/issues/events{/number}",
+        "events_url": "https://api.github.com/repos/electron/electron/events",
+        "assignees_url": "https://api.github.com/repos/electron/electron/assignees{/user}",
+        "branches_url": "https://api.github.com/repos/electron/electron/branches{/branch}",
+        "tags_url": "https://api.github.com/repos/electron/electron/tags",
+        "blobs_url": "https://api.github.com/repos/electron/electron/git/blobs{/sha}",
+        "git_tags_url": "https://api.github.com/repos/electron/electron/git/tags{/sha}",
+        "git_refs_url": "https://api.github.com/repos/electron/electron/git/refs{/sha}",
+        "trees_url": "https://api.github.com/repos/electron/electron/git/trees{/sha}",
+        "statuses_url": "https://api.github.com/repos/electron/electron/statuses/{sha}",
+        "languages_url": "https://api.github.com/repos/electron/electron/languages",
+        "stargazers_url": "https://api.github.com/repos/electron/electron/stargazers",
+        "contributors_url": "https://api.github.com/repos/electron/electron/contributors",
+        "subscribers_url": "https://api.github.com/repos/electron/electron/subscribers",
+        "subscription_url": "https://api.github.com/repos/electron/electron/subscription",
+        "commits_url": "https://api.github.com/repos/electron/electron/commits{/sha}",
+        "git_commits_url": "https://api.github.com/repos/electron/electron/git/commits{/sha}",
+        "comments_url": "https://api.github.com/repos/electron/electron/comments{/number}",
+        "issue_comment_url": "https://api.github.com/repos/electron/electron/issues/comments{/number}",
+        "contents_url": "https://api.github.com/repos/electron/electron/contents/{+path}",
+        "compare_url": "https://api.github.com/repos/electron/electron/compare/{base}...{head}",
+        "merges_url": "https://api.github.com/repos/electron/electron/merges",
+        "archive_url": "https://api.github.com/repos/electron/electron/{archive_format}{/ref}",
+        "downloads_url": "https://api.github.com/repos/electron/electron/downloads",
+        "issues_url": "https://api.github.com/repos/electron/electron/issues{/number}",
+        "pulls_url": "https://api.github.com/repos/electron/electron/pulls{/number}",
+        "milestones_url": "https://api.github.com/repos/electron/electron/milestones{/number}",
+        "notifications_url": "https://api.github.com/repos/electron/electron/notifications{?since,all,participating}",
+        "labels_url": "https://api.github.com/repos/electron/electron/labels{/name}",
+        "releases_url": "https://api.github.com/repos/electron/electron/releases{/id}",
+        "deployments_url": "https://api.github.com/repos/electron/electron/deployments",
+        "created_at": "2013-04-12T01:47:36Z",
+        "updated_at": "2023-12-24T11:44:05Z",
+        "pushed_at": "2023-07-24T12:32:11Z",
+        "git_url": "git://github.com/electron/electron.git",
+        "ssh_url": "git@github.com:electron/electron.git",
+        "clone_url": "https://github.com/electron/electron.git",
+        "svn_url": "https://github.com/electron/electron",
+        "homepage": "https://electronjs.org",
+        "size": 133983,
+        "stargazers_count": 108314,
+        "watchers_count": 108314,
+        "language": "C++",
+        "has_issues": true,
+        "has_projects": true,
+        "has_downloads": true,
+        "has_wiki": false,
+        "has_pages": false,
+        "has_discussions": false,
+        "forks_count": 14855,
+        "mirror_url": null,
+        "archived": false,
+        "disabled": false,
+        "open_issues_count": 926,
+        "license": {
+          "key": "mit",
+          "name": "MIT License",
+          "spdx_id": "MIT",
+          "url": "https://api.github.com/licenses/mit",
+          "node_id": "MDc6TGljZW5zZTEz"
+        },
+        "allow_forking": true,
+        "is_template": false,
+        "web_commit_signoff_required": false,
+        "topics": [
+          "c-plus-plus",
+          "chrome",
+          "css",
+          "electron",
+          "html",
+          "javascript",
+          "nodejs",
+          "v8",
+          "works-with-codespaces"
+        ],
+        "visibility": "public",
+        "forks": 14855,
+        "open_issues": 926,
+        "watchers": 108314,
+        "default_branch": "main",
+        "allow_squash_merge": true,
+        "allow_merge_commit": false,
+        "allow_rebase_merge": false,
+        "allow_auto_merge": false,
+        "delete_branch_on_merge": true,
+        "allow_update_branch": false,
+        "use_squash_pr_title_as_default": true,
+        "squash_merge_commit_message": "COMMIT_MESSAGES",
+        "squash_merge_commit_title": "PR_TITLE",
+        "merge_commit_message": "PR_TITLE",
+        "merge_commit_title": "MERGE_MESSAGE"
+      }
+    },
+    "_links": {
+      "self": {
+        "href": "https://api.github.com/repos/electron/electron/pulls/38982"
+      },
+      "html": {
+        "href": "https://github.com/electron/electron/pull/38982"
+      },
+      "issue": {
+        "href": "https://api.github.com/repos/electron/electron/issues/38982"
+      },
+      "comments": {
+        "href": "https://api.github.com/repos/electron/electron/issues/38982/comments"
+      },
+      "review_comments": {
+        "href": "https://api.github.com/repos/electron/electron/pulls/38982/comments"
+      },
+      "review_comment": {
+        "href": "https://api.github.com/repos/electron/electron/pulls/comments{/number}"
+      },
+      "commits": {
+        "href": "https://api.github.com/repos/electron/electron/pulls/38982/commits"
+      },
+      "statuses": {
+        "href": "https://api.github.com/repos/electron/electron/statuses/759f1e84af46b7feddf973be4b63ae29ff98a7bf"
+      }
+    },
+    "author_association": "MEMBER",
+    "auto_merge": null,
+    "active_lock_reason": null,
+    "merged": false,
+    "mergeable": true,
+    "rebaseable": true,
+    "mergeable_state": "unstable",
+    "merged_by": null,
+    "comments": 0,
+    "review_comments": 0,
+    "maintainer_can_modify": false,
+    "commits": 1,
+    "additions": 20,
+    "deletions": 2,
+    "changed_files": 6
+  },
+  "label": {
+    "id": 1603621692,
+    "node_id": "MDU6TGFiZWwxNjAzNjIxNjky",
+    "url": "https://api.github.com/repos/electron/electron/labels/api-review/requested%20%F0%9F%97%B3",
+    "name": "api-review/requested 🗳",
+    "color": "c918ba",
+    "default": false,
+    "description": ""
+  },
+  "repository": {
+    "id": 9384267,
+    "node_id": "MDEwOlJlcG9zaXRvcnk5Mzg0MjY3",
+    "name": "electron",
+    "full_name": "electron/electron",
+    "private": false,
+    "owner": {
+      "login": "electron",
+      "id": 13409222,
+      "node_id": "MDEyOk9yZ2FuaXphdGlvbjEzNDA5MjIy",
+      "avatar_url": "https://avatars.githubusercontent.com/u/13409222?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/electron",
+      "html_url": "https://github.com/electron",
+      "followers_url": "https://api.github.com/users/electron/followers",
+      "following_url": "https://api.github.com/users/electron/following{/other_user}",
+      "gists_url": "https://api.github.com/users/electron/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/electron/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/electron/subscriptions",
+      "organizations_url": "https://api.github.com/users/electron/orgs",
+      "repos_url": "https://api.github.com/users/electron/repos",
+      "events_url": "https://api.github.com/users/electron/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/electron/received_events",
+      "type": "Organization",
+      "site_admin": false
+    },
+    "html_url": "https://github.com/electron/electron",
+    "description": ":electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS",
+    "fork": false,
+    "url": "https://api.github.com/repos/electron/electron",
+    "forks_url": "https://api.github.com/repos/electron/electron/forks",
+    "keys_url": "https://api.github.com/repos/electron/electron/keys{/key_id}",
+    "collaborators_url": "https://api.github.com/repos/electron/electron/collaborators{/collaborator}",
+    "teams_url": "https://api.github.com/repos/electron/electron/teams",
+    "hooks_url": "https://api.github.com/repos/electron/electron/hooks",
+    "issue_events_url": "https://api.github.com/repos/electron/electron/issues/events{/number}",
+    "events_url": "https://api.github.com/repos/electron/electron/events",
+    "assignees_url": "https://api.github.com/repos/electron/electron/assignees{/user}",
+    "branches_url": "https://api.github.com/repos/electron/electron/branches{/branch}",
+    "tags_url": "https://api.github.com/repos/electron/electron/tags",
+    "blobs_url": "https://api.github.com/repos/electron/electron/git/blobs{/sha}",
+    "git_tags_url": "https://api.github.com/repos/electron/electron/git/tags{/sha}",
+    "git_refs_url": "https://api.github.com/repos/electron/electron/git/refs{/sha}",
+    "trees_url": "https://api.github.com/repos/electron/electron/git/trees{/sha}",
+    "statuses_url": "https://api.github.com/repos/electron/electron/statuses/{sha}",
+    "languages_url": "https://api.github.com/repos/electron/electron/languages",
+    "stargazers_url": "https://api.github.com/repos/electron/electron/stargazers",
+    "contributors_url": "https://api.github.com/repos/electron/electron/contributors",
+    "subscribers_url": "https://api.github.com/repos/electron/electron/subscribers",
+    "subscription_url": "https://api.github.com/repos/electron/electron/subscription",
+    "commits_url": "https://api.github.com/repos/electron/electron/commits{/sha}",
+    "git_commits_url": "https://api.github.com/repos/electron/electron/git/commits{/sha}",
+    "comments_url": "https://api.github.com/repos/electron/electron/comments{/number}",
+    "issue_comment_url": "https://api.github.com/repos/electron/electron/issues/comments{/number}",
+    "contents_url": "https://api.github.com/repos/electron/electron/contents/{+path}",
+    "compare_url": "https://api.github.com/repos/electron/electron/compare/{base}...{head}",
+    "merges_url": "https://api.github.com/repos/electron/electron/merges",
+    "archive_url": "https://api.github.com/repos/electron/electron/{archive_format}{/ref}",
+    "downloads_url": "https://api.github.com/repos/electron/electron/downloads",
+    "issues_url": "https://api.github.com/repos/electron/electron/issues{/number}",
+    "pulls_url": "https://api.github.com/repos/electron/electron/pulls{/number}",
+    "milestones_url": "https://api.github.com/repos/electron/electron/milestones{/number}",
+    "notifications_url": "https://api.github.com/repos/electron/electron/notifications{?since,all,participating}",
+    "labels_url": "https://api.github.com/repos/electron/electron/labels{/name}",
+    "releases_url": "https://api.github.com/repos/electron/electron/releases{/id}",
+    "deployments_url": "https://api.github.com/repos/electron/electron/deployments",
+    "created_at": "2013-04-12T01:47:36Z",
+    "updated_at": "2023-12-24T11:44:05Z",
+    "pushed_at": "2023-07-24T12:32:11Z",
+    "git_url": "git://github.com/electron/electron.git",
+    "ssh_url": "git@github.com:electron/electron.git",
+    "clone_url": "https://github.com/electron/electron.git",
+    "svn_url": "https://github.com/electron/electron",
+    "homepage": "https://electronjs.org",
+    "size": 133983,
+    "stargazers_count": 108314,
+    "watchers_count": 108314,
+    "language": "C++",
+    "has_issues": true,
+    "has_projects": true,
+    "has_downloads": true,
+    "has_wiki": false,
+    "has_pages": false,
+    "has_discussions": false,
+    "forks_count": 14855,
+    "mirror_url": null,
+    "archived": false,
+    "disabled": false,
+    "open_issues_count": 926,
+    "license": {
+      "key": "mit",
+      "name": "MIT License",
+      "spdx_id": "MIT",
+      "url": "https://api.github.com/licenses/mit",
+      "node_id": "MDc6TGljZW5zZTEz"
+    },
+    "allow_forking": true,
+    "is_template": false,
+    "web_commit_signoff_required": false,
+    "topics": [
+      "c-plus-plus",
+      "chrome",
+      "css",
+      "electron",
+      "html",
+      "javascript",
+      "nodejs",
+      "v8",
+      "works-with-codespaces"
+    ],
+    "visibility": "public",
+    "forks": 14855,
+    "open_issues": 926,
+    "watchers": 108314,
+    "default_branch": "main"
+  },
+  "organization": {
+    "login": "electron",
+    "id": 13409222,
+    "node_id": "MDEyOk9yZ2FuaXphdGlvbjEzNDA5MjIy",
+    "url": "https://api.github.com/orgs/electron",
+    "repos_url": "https://api.github.com/orgs/electron/repos",
+    "events_url": "https://api.github.com/orgs/electron/events",
+    "hooks_url": "https://api.github.com/orgs/electron/hooks",
+    "issues_url": "https://api.github.com/orgs/electron/issues",
+    "members_url": "https://api.github.com/orgs/electron/members{/member}",
+    "public_members_url": "https://api.github.com/orgs/electron/public_members{/member}",
+    "avatar_url": "https://avatars.githubusercontent.com/u/13409222?v=4",
+    "description": "Build cross platform desktop apps with JavaScript, HTML, and CSS"
+  },
+  "sender": {
+    "login": "electron-cation[bot]",
+    "id": 47864737,
+    "node_id": "MDM6Qm90NDc4NjQ3Mzc=",
+    "avatar_url": "https://avatars.githubusercontent.com/in/25811?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/electron-cation%5Bbot%5D",
+    "html_url": "https://github.com/apps/electron-cation",
+    "followers_url": "https://api.github.com/users/electron-cation%5Bbot%5D/followers",
+    "following_url": "https://api.github.com/users/electron-cation%5Bbot%5D/following{/other_user}",
+    "gists_url": "https://api.github.com/users/electron-cation%5Bbot%5D/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/electron-cation%5Bbot%5D/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/electron-cation%5Bbot%5D/subscriptions",
+    "organizations_url": "https://api.github.com/users/electron-cation%5Bbot%5D/orgs",
+    "repos_url": "https://api.github.com/users/electron-cation%5Bbot%5D/repos",
+    "events_url": "https://api.github.com/users/electron-cation%5Bbot%5D/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/electron-cation%5Bbot%5D/received_events",
+    "type": "Bot",
+    "site_admin": false
+  },
+  "installation": {
+    "id": 18942820,
+    "node_id": "MDIzOkludGVncmF0aW9uSW5zdGFsbGF0aW9uMTg5NDI4MjA="
+  }
+}
diff --git a/test/index.test.ts b/test/index.test.ts
index 1e11d19..b81044b 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -58,4 +58,12 @@ describe('New PR Slack Notifications', () => {
 
     expect(client.chat.postMessage).toHaveBeenCalled();
   });
+
+  it('does not post to Slack in the month of December', async () => {
+    const payload = require('./fixtures/pull_request.labeled.december.json');
+
+    await probot.receive({ name: 'pull_request', payload, id: 'abc123' });
+
+    expect(client.chat.postMessage).not.toHaveBeenCalled();
+  });
 });