Most often in December, 24 days.
Highest follower count seen that year: 28,235.
January
Jan 6 04:00–07:00 Jan 8 04:00–06:00 Jan 9 04:00–06:00 Jan 11 04:00–06:00 Jan 12 04:00–06:00 Jan 14 04:00–06:00 Jan 15 03:00–06:00 Jan 16 04:00–06:00 Jan 17 04:00–06:00 Jan 18 04:00–06:00 Jan 25 04:00–06:00 Jan 26 04:00–06:00
February
Feb 2 04:00–07:00 Feb 9 04:00–07:00 Feb 15 03:00–06:00 Feb 16 04:00–07:00 Feb 19 03:00–06:00 Feb 20 03:00–06:00 Feb 22 04:00–08:00
March
Mar 2 04:00–08:00 Mar 16 03:00–07:00 Mar 17 04:00–06:00 Mar 22 04:00–06:00 Mar 23 04:00–07:00 Mar 25 04:00–06:00 Mar 29 04:00–08:00
April
Apr 2 04:00–06:00 Apr 3 04:00–07:00 Apr 4 03:00–06:00 Apr 5 04:00–06:00 Apr 7 04:00–07:00 Apr 8 04:00–06:00 Apr 9 04:00–06:00 Apr 10 04:00–06:00 Apr 11 04:00–05:00 Apr 12 04:00–06:00 Apr 14 04:00–06:00 Apr 15 04:00–05:00 Apr 17 04:00–06:00 Apr 18 04:00–06:00 Apr 19 04:00–06:00 Apr 21 04:00–06:00 Apr 22 04:00–07:00 Apr 23 04:00–06:00 Apr 24 04:00–05:00 Apr 25 04:00–06:00 Apr 28 04:00–06:00 Apr 30 04:00–06:00
May
May 3 04:00–06:00 May 5 04:00–06:00 May 6 03:00–06:00 May 7 04:00–06:00 May 8 03:00–05:00 May 10 03:00–06:00 May 12 04:00–06:00 May 13 04:00–06:00 May 14 03:00–07:00 May 15 04:00–06:00 May 16 03:00–05:00 May 19 03:00–06:00 May 20 04:00–06:00 May 21 04:00–05:00 May 22 04:00–06:00 May 23 04:00–05:00 May 26 04:00–06:00 May 27 03:00–05:00 May 28 04:00–06:00 May 29 04:00–06:00
June
Jun 3 04:00–06:00 Jun 4 04:00–06:00 Jun 5 04:00–06:00 Jun 6 03:00–06:00 Jun 9 04:00–06:00 Jun 10 03:00–07:00 Jun 11 04:00–06:00 Jun 16 04:00–06:00 Jun 17 04:00–06:00 Jun 18 03:00–06:00 Jun 19 04:00–07:00 Jun 20 04:00–05:00 Jun 23 03:00–06:00 Jun 24 03:00–06:00 Jun 25 04:00–06:00 Jun 26 04:00–06:00 Jun 27 03:00–06:00 Jun 28 04:00–06:00 Jun 30 04:00–05:00
July
Jul 2 03:00–06:00 Jul 3 04:00–06:00 Jul 4 03:00–06:00 Jul 7 04:00–06:00 Jul 8 04:00–05:00 Jul 10 04:00–06:00 Jul 11 03:00–06:00 Jul 13 03:00–05:00 Jul 14 04:00–06:00 Jul 15 04:00–06:00 Jul 16 04:00–06:00 Jul 17 04:00–06:00 Jul 18 03:00–05:00 Jul 20 03:00–06:00 Jul 21 04:00–06:00, 15:00–17:00 Jul 22 04:00–06:00, 15:00–17:00 Jul 23 04:00–05:00, 15:00–17:00 Jul 24 04:00–06:00, 16:00–17:00 Jul 25 03:00–05:00, 15:00–17:00 Jul 27 04:00–06:00 Jul 28 04:00–05:00 Jul 29 03:00–06:00 Jul 30 03:00–06:00 Jul 31 03:00–06:00
August
Aug 1 04:00–06:00 Aug 4 03:00–06:00, 15:00–17:00 Aug 6 04:00–06:00, 15:00–17:00 Aug 7 04:00–06:00, 15:00–18:00 Aug 8 04:00–06:00 Aug 10 03:00–06:00 Aug 11 04:00–06:00, 15:00–18:00 Aug 12 16:00–18:00 Aug 13 04:00–06:00, 15:00–17:00 Aug 14 04:00–06:00 Aug 15 04:00–06:00 Aug 18 04:00–06:00, 16:00–18:00 Aug 19 04:00–06:00, 15:00–18:00 Aug 20 04:00–06:00, 15:00–18:00 Aug 21 04:00–06:00, 16:00–18:00 Aug 22 03:00–06:00 Aug 24 04:00–07:00, 15:00–17:00 Aug 26 03:00–06:00, 15:00–18:00 Aug 27 04:00–06:00, 11:00–17:00 Aug 28 04:00–09:00 Aug 29 04:00–06:00, 08:00–10:00
September
Sep 1 04:00–10:00, 16:00–18:00 Sep 2 04:00–09:00 Sep 3 10:00–12:00, 16:00–17:00 Sep 4 04:00–09:00 Sep 8 04:00–07:00, 09:00–12:00, 16:00–18:00 Sep 9 04:00–09:00 Sep 10 04:00–08:00 Sep 11 04:00–10:00, 15:00–18:00 Sep 12 04:00–09:00 Sep 15 04:00–08:00 Sep 16 04:00–09:00, 15:00–17:00 Sep 17 04:00–09:00 Sep 20 07:00–10:00 Sep 22 07:00–10:00, 15:00–17:00 Sep 23 04:00–09:00 Sep 24 04:00–09:00 Sep 25 07:00–10:00 Sep 26 04:00–09:00 Sep 27 03:00–08:00 Sep 29 03:00–09:00 Sep 30 04:00–06:00, 15:00–18:00
October
Oct 1 03:00–09:00 Oct 2 04:00–06:00, 15:00–18:00 Oct 3 04:00–09:00 Oct 5 04:00–09:00 Oct 6 04:00–09:00 Oct 7 04:00–09:00, 16:00–18:00 Oct 8 04:00–09:00 Oct 9 04:00–08:00 Oct 10 04:00–08:00 Oct 13 04:00–09:00 Oct 14 04:00–09:00 Oct 15 04:00–09:00 Oct 16 04:00–09:00 Oct 19 06:00–08:00 Oct 20 04:00–09:00 Oct 21 04:00–09:00, 15:00–17:00 Oct 22 04:00–05:00, 07:00–09:00 Oct 24 04:00–09:00 Oct 25 04:00–08:00 Oct 26 04:00–09:00 Oct 27 04:00–09:00, 15:00–17:00 Oct 28 04:00–06:00
November
Nov 5 03:00–09:00 Nov 6 04:00–09:00 Nov 7 04:00–09:00 Nov 8 07:00–09:00 Nov 9 07:00–10:00, 17:00–19:00 Nov 10 04:00–09:00 Nov 11 04:00–09:00, 15:00–17:00 Nov 12 04:00–06:00, 16:00–18:00 Nov 13 04:00–09:00 Nov 30 07:00–10:00, 15:00–18:00
December
Dec 1 07:00–10:00 Dec 2 07:00–09:00 Dec 3 04:00–08:00 Dec 4 04:00–08:00 Dec 5 08:00–09:00 Dec 7 04:00–10:00 Dec 8 07:00–09:00 Dec 9 03:00–09:00 Dec 10 04:00–09:00 Dec 11 04:00–07:00 Dec 12 04:00–10:00 Dec 14 04:00–06:00 Dec 15 04:00–09:00 Dec 16 04:00–09:00 Dec 17 04:00–09:00 Dec 18 03:00–09:00 Dec 19 07:00–09:00 Dec 21 06:00–09:00 Dec 22 04:00–09:00 Dec 23 04:00–09:00 Dec 24 04:00–10:00 Dec 25 04:00–09:00 Dec 26 04:00–06:00 Dec 29 06:00–09:00, 14:00–16:00