Most often in January, 31 days.
Highest follower count seen that year: 27,936.
January
Jan 1 04:00–05:00, 18:00–20:00 Jan 2 02:00–06:00, 19:00–21:00 Jan 3 02:00–06:00, 18:00–22:00 Jan 4 01:00–04:00, 18:00–20:00 Jan 5 03:00–06:00, 18:00–21:00 Jan 6 02:00–05:00, 19:00–22:00 Jan 7 02:00–05:00, 18:00–22:00 Jan 8 02:00–04:00, 19:00–21:00 Jan 9 02:00–05:00, 18:00–21:00 Jan 10 02:00–04:00, 19:00–21:00 Jan 11 02:00–05:00, 18:00–21:00 Jan 12 02:00–03:00, 18:00–22:00 Jan 13 02:00–06:00, 19:00–22:00 Jan 14 02:00–04:00, 18:00–21:00 Jan 15 19:00–21:00 Jan 16 02:00–06:00, 19:00–21:00 Jan 17 02:00–06:00, 19:00–21:00 Jan 18 02:00–05:00, 20:00–23:00 Jan 19 02:00–05:00, 20:00–22:00 Jan 20 02:00–05:00, 20:00–23:00 Jan 21 02:00–06:00, 20:00–23:00 Jan 22 02:00–05:00, 19:00–21:00 Jan 23 02:00–05:00, 19:00–22:00 Jan 24 02:00–06:00, 19:00–22:00 Jan 25 02:00–05:00, 20:00–23:00 Jan 26 03:00–05:00, 20:00–22:00 Jan 27 02:00–06:00 Jan 28 19:00–23:00 Jan 29 03:00–06:00, 19:00–22:00 Jan 30 03:00–05:00, 19:00–22:00 Jan 31 03:00–05:00, 19:00–23:00
February
Feb 1 02:00–05:00, 19:00–22:00 Feb 2 03:00–05:00 Feb 3 19:00–21:00 Feb 4 03:00–06:00, 19:00–23:00 Feb 5 03:00–05:00, 19:00–23:00 Feb 6 03:00–06:00, 19:00–21:00 Feb 7 02:00–05:00 Feb 8 03:00–06:00, 20:00–23:00 Feb 9 03:00–06:00, 19:00–22:00 Feb 10 03:00–06:00, 20:00–23:00 Feb 11 03:00–06:00, 19:00–22:00 Feb 12 03:00–06:00, 19:00–22:00 Feb 13 02:00–06:00, 19:00–22:00 Feb 14 02:00–05:00, 19:00–22:00 Feb 15 03:00–06:00, 20:00–23:00 Feb 16 02:00–05:00, 18:00–22:00 Feb 17 03:00–04:00, 20:00–23:00 Feb 18 03:00–06:00, 21:00–24:00 Feb 19 19:00–22:00 Feb 20 03:00–06:00, 20:00–23:00 Feb 21 03:00–06:00, 18:00–22:00 Feb 22 03:00–06:00, 19:00–22:00 Feb 23 02:00–06:00, 19:00–22:00 Feb 24 02:00–05:00, 19:00–22:00 Feb 25 03:00–07:00, 19:00–22:00 Feb 26 03:00–06:00, 19:00–23:00 Feb 27 03:00–06:00, 19:00–23:00 Feb 28 03:00–06:00, 19:00–22:00
March
Mar 1 03:00–06:00, 19:00–20:00 Mar 2 04:00–06:00, 19:00–23:00 Mar 3 02:00–06:00, 19:00–23:00 Mar 4 03:00–06:00, 18:00–22:00 Mar 5 04:00–05:00, 19:00–22:00 Mar 6 03:00–06:00, 19:00–23:00 Mar 7 03:00–07:00, 19:00–22:00 Mar 8 03:00–07:00, 19:00–20:00 Mar 9 03:00–06:00, 18:00–22:00 Mar 10 03:00–06:00, 18:00–22:00 Mar 11 02:00–06:00, 18:00–21:00 Mar 12 02:00–05:00, 18:00–22:00 Mar 13 03:00–04:00, 18:00–22:00 Mar 14 01:00–04:00, 18:00–22:00 Mar 15 02:00–05:00, 18:00–21:00 Mar 16 01:00–04:00, 22:00–24:00 Mar 17 00:00–03:00, 18:00–24:00 Mar 20 02:00–06:00, 22:00–24:00 Mar 21 00:00–03:00 Mar 22 18:00–19:00 Mar 23 01:00–06:00, 18:00–24:00 Mar 24 22:00–24:00 Mar 25 00:00–02:00 Mar 26 21:00–24:00 Mar 27 18:00–22:00 Mar 28 02:00–05:00 Mar 29 02:00–06:00, 21:00–24:00 Mar 30 00:00–02:00 Mar 31 01:00–04:00, 18:00–24:00
April
Apr 1 02:00–03:00 Apr 2 02:00–05:00 Apr 4 01:00–06:00 Apr 6 21:00–23:00 Apr 7 22:00–24:00 Apr 8 00:00–02:00 Apr 9 02:00–05:00, 21:00–24:00 Apr 10 00:00–06:00, 21:00–24:00 Apr 11 01:00–06:00, 18:00–21:00 Apr 12 21:00–24:00 Apr 13 00:00–05:00 Apr 14 01:00–06:00, 21:00–24:00 Apr 15 00:00–03:00 Apr 16 02:00–05:00, 21:00–24:00 Apr 17 00:00–01:00, 19:00–21:00 Apr 19 02:00–06:00 Apr 21 02:00–06:00 Apr 22 02:00–05:00 Apr 23 02:00–04:00 Apr 24 02:00–05:00, 18:00–21:00 Apr 25 18:00–23:00 Apr 26 02:00–05:00 Apr 27 02:00–04:00 Apr 28 02:00–06:00, 21:00–24:00 Apr 29 00:00–01:00, 03:00–05:00 Apr 30 02:00–05:00, 21:00–24:00
May
May 1 00:00–01:00, 18:00–22:00 May 3 00:00–04:00 May 9 02:00–05:00 May 10 23:00–24:00 May 11 00:00–02:00 May 12 02:00–04:00, 22:00–24:00 May 13 00:00–04:00 May 14 01:00–04:00 May 15 01:00–06:00, 18:00–22:00 May 17 01:00–03:00 May 18 01:00–05:00 May 19 01:00–05:00 May 21 01:00–05:00, 20:00–23:00 May 22 20:00–24:00 May 24 01:00–05:00 May 25 01:00–04:00, 17:00–20:00 May 27 02:00–06:00 May 28 01:00–05:00 May 30 00:00–04:00 May 31 00:00–02:00
June
Jun 1 02:00–05:00, 17:00–18:00 Jun 4 02:00–05:00 Jun 5 02:00–05:00, 22:00–24:00 Jun 6 03:00–05:00 Jun 7 01:00–04:00, 22:00–24:00 Jun 8 00:00–03:00, 23:00–24:00 Jun 9 00:00–03:00 Jun 10 22:00–24:00 Jun 11 00:00–02:00, 22:00–24:00 Jun 12 00:00–02:00 Jun 13 01:00–04:00 Jun 14 01:00–03:00, 23:00–24:00 Jun 15 00:00–03:00, 17:00–19:00 Jun 18 01:00–03:00, 22:00–24:00 Jun 19 00:00–01:00, 22:00–24:00 Jun 20 00:00–02:00 Jun 21 02:00–05:00 Jun 22 02:00–04:00 Jun 23 23:00–24:00 Jun 24 00:00–02:00, 23:00–24:00 Jun 25 00:00–02:00, 23:00–24:00 Jun 26 00:00–02:00, 23:00–24:00 Jun 27 00:00–04:00, 23:00–24:00 Jun 28 00:00–03:00, 18:00–21:00 Jun 29 20:00–24:00 Jun 30 00:00–04:00
July
Jul 2 01:00–05:00, 22:00–24:00 Jul 3 00:00–02:00, 18:00–22:00 Jul 4 15:00–19:00 Jul 6 02:00–04:00 Jul 7 02:00–03:00 Jul 8 23:00–24:00 Jul 9 00:00–04:00 Jul 10 01:00–04:00 Jul 11 01:00–05:00, 23:00–24:00 Jul 12 00:00–01:00 Jul 13 02:00–04:00, 23:00–24:00 Jul 14 00:00–05:00 Jul 15 23:00–24:00 Jul 16 00:00–05:00, 23:00–24:00 Jul 17 00:00–02:00, 23:00–24:00 Jul 18 00:00–01:00 Jul 19 01:00–02:00 Jul 20 01:00–03:00, 17:00–21:00 Jul 22 00:00–03:00 Jul 23 23:00–24:00 Jul 24 00:00–02:00, 23:00–24:00 Jul 25 00:00–03:00 Jul 26 01:00–07:00 Jul 27 01:00–06:00, 18:00–20:00 Jul 28 23:00–24:00 Jul 30 00:00–01:00, 23:00–24:00 Jul 31 00:00–02:00, 23:00–24:00
August
Aug 1 00:00–02:00 Aug 2 17:00–21:00 Aug 3 17:00–21:00 Aug 4 00:00–01:00 Aug 5 23:00–24:00 Aug 6 00:00–02:00, 18:00–21:00 Aug 8 23:00–24:00 Aug 9 01:00–03:00, 23:00–24:00 Aug 10 00:00–02:00 Aug 11 23:00–24:00 Aug 12 00:00–02:00, 23:00–24:00 Aug 13 00:00–01:00, 23:00–24:00 Aug 14 00:00–02:00, 23:00–24:00 Aug 15 00:00–02:00, 23:00–24:00 Aug 16 00:00–02:00, 21:00–23:00 Aug 17 23:00–24:00 Aug 18 00:00–01:00, 23:00–24:00 Aug 19 00:00–01:00, 23:00–24:00 Aug 20 04:00–05:00, 21:00–22:00 Aug 25 23:00–24:00 Aug 26 00:00–01:00 Aug 27 01:00–03:00, 23:00–24:00 Aug 28 00:00–01:00, 23:00–24:00 Aug 29 00:00–01:00, 23:00–24:00 Aug 30 00:00–01:00, 23:00–24:00 Aug 31 00:00–01:00, 23:00–24:00
September
Sep 3 01:00–03:00, 23:00–24:00 Sep 4 00:00–01:00, 23:00–24:00 Sep 5 00:00–01:00, 23:00–24:00 Sep 6 23:00–24:00 Sep 7 00:00–01:00, 23:00–24:00 Sep 8 00:00–01:00, 23:00–24:00 Sep 9 00:00–02:00 Sep 10 01:00–03:00, 21:00–23:00 Sep 11 21:00–23:00 Sep 17 01:00–03:00, 23:00–24:00 Sep 18 00:00–01:00 Sep 20 23:00–24:00 Sep 21 00:00–01:00, 17:00–21:00 Sep 22 23:00–24:00 Sep 23 00:00–01:00, 23:00–24:00 Sep 24 00:00–02:00, 23:00–24:00 Sep 25 00:00–01:00 Sep 26 23:00–24:00 Sep 27 00:00–01:00 Sep 28 19:00–21:00 Sep 29 23:00–24:00 Sep 30 00:00–01:00
October
Oct 1 01:00–03:00, 23:00–24:00 Oct 2 23:00–24:00 Oct 4 23:00–24:00 Oct 5 00:00–04:00, 23:00–24:00 Oct 6 00:00–04:00, 21:00–24:00 Oct 7 23:00–24:00 Oct 8 00:00–04:00, 23:00–24:00 Oct 9 00:00–01:00 Oct 11 18:00–21:00 Oct 12 18:00–21:00 Oct 13 23:00–24:00 Oct 15 01:00–04:00, 23:00–24:00 Oct 16 00:00–01:00, 23:00–24:00 Oct 19 23:00–24:00 Oct 20 23:00–24:00 Oct 21 00:00–01:00 Oct 22 02:00–03:00, 23:00–24:00 Oct 23 00:00–01:00 Oct 26 00:00–02:00, 23:00–24:00 Oct 27 00:00–01:00, 23:00–24:00 Oct 28 00:00–01:00 Oct 29 01:00–03:00, 23:00–24:00 Oct 30 00:00–02:00, 23:00–24:00 Oct 31 00:00–02:00
November
Nov 3 00:00–02:00 Nov 4 00:00–02:00 Nov 5 03:00–05:00 Nov 6 00:00–03:00 Nov 7 00:00–01:00 Nov 10 00:00–02:00 Nov 11 00:00–03:00 Nov 12 02:00–05:00, 19:00–21:00 Nov 13 20:00–22:00 Nov 17 02:00–03:00, 20:00–22:00 Nov 18 20:00–23:00 Nov 19 20:00–22:00 Nov 20 20:00–22:00 Nov 23 18:00–21:00 Nov 25 00:00–04:00 Nov 26 02:00–04:00 Nov 27 00:00–02:00 Nov 28 02:00–03:00
December
Dec 1 00:00–03:00, 22:00–24:00 Dec 2 00:00–01:00, 21:00–24:00 Dec 4 00:00–03:00 Dec 5 00:00–03:00 Dec 8 02:00–04:00 Dec 9 00:00–03:00 Dec 10 04:00–06:00 Dec 11 03:00–05:00 Dec 12 03:00–06:00 Dec 16 04:00–07:00 Dec 17 03:00–06:00 Dec 18 03:00–06:00 Dec 19 03:00–05:00 Dec 20 03:00–06:00 Dec 29 02:00–03:00, 22:00–24:00 Dec 30 00:00–01:00 Dec 31 19:00–22:00