Most often in July, 27 days.
Highest follower count seen that year: 2,683.
January
Jan 7 03:00–07:00, 23:00–24:00 Jan 8 00:00–05:00, 23:00–24:00 Jan 9 00:00–03:00, 23:00–24:00 Jan 10 00:00–04:00 Jan 13 04:00–07:00, 22:00–24:00 Jan 14 00:00–04:00, 23:00–24:00 Jan 15 00:00–02:00, 23:00–24:00 Jan 16 00:00–03:00, 22:00–24:00 Jan 17 00:00–04:00 Jan 20 02:00–07:00 Jan 21 02:00–07:00 Jan 22 05:00–07:00, 23:00–24:00 Jan 23 00:00–06:00 Jan 24 02:00–03:00 Jan 28 03:00–07:00 Jan 29 22:00–24:00 Jan 30 00:00–06:00, 23:00–24:00 Jan 31 00:00–07:00
February
Feb 2 22:00–24:00 Feb 3 00:00–04:00, 23:00–24:00 Feb 4 00:00–06:00 Feb 5 04:00–07:00, 23:00–24:00 Feb 6 00:00–06:00, 23:00–24:00 Feb 7 00:00–04:00 Feb 10 05:00–07:00 Feb 11 04:00–07:00 Feb 12 04:00–07:00 Feb 19 05:00–07:00, 23:00–24:00 Feb 20 00:00–06:00, 23:00–24:00 Feb 21 00:00–05:00 Feb 24 02:00–07:00 Feb 25 05:00–07:00 Feb 26 05:00–07:00, 23:00–24:00 Feb 27 00:00–07:00 Feb 28 02:00–07:00
March
Mar 2 03:00–05:00 Mar 3 05:00–07:00 Mar 4 03:00–07:00, 23:00–24:00 Mar 5 00:00–03:00 Mar 11 06:00–07:00 Mar 12 04:00–07:00, 23:00–24:00 Mar 13 03:00–04:00 Mar 14 00:00–04:00 Mar 17 06:00–07:00 Mar 18 06:00–07:00 Mar 19 06:00–07:00, 23:00–24:00 Mar 20 00:00–06:00 Mar 21 00:00–03:00 Mar 24 06:00–07:00 Mar 25 05:00–07:00 Mar 26 03:00–07:00 Mar 27 00:00–05:00 Mar 28 00:00–06:00 Mar 31 03:00–07:00
April
Apr 1 03:00–07:00 Apr 2 02:00–06:00 Apr 3 00:00–03:00, 23:00–24:00 Apr 4 00:00–05:00 Apr 8 07:00–08:00 Apr 9 06:00–08:00, 23:00–24:00 Apr 10 00:00–05:00 Apr 11 00:00–01:00, 04:00–06:00 Apr 15 06:00–08:00 Apr 16 06:00–08:00, 23:00–24:00 Apr 17 00:00–05:00 Apr 22 07:00–08:00 Apr 23 06:00–08:00, 23:00–24:00 Apr 24 00:00–01:00, 03:00–08:00 Apr 29 06:00–07:00 Apr 30 06:00–08:00
May
May 1 06:00–08:00 May 2 00:00–04:00 May 3 00:00–04:00 May 6 06:00–08:00 May 7 06:00–08:00 May 8 00:00–05:00, 22:00–24:00 May 9 00:00–01:00, 05:00–07:00 May 10 01:00–03:00 May 13 06:00–07:00 May 14 06:00–08:00, 23:00–24:00 May 15 05:00–06:00 May 16 00:00–02:00, 05:00–07:00 May 17 02:00–04:00, 23:00–24:00 May 19 06:00–08:00 May 21 01:00–05:00, 23:00–24:00 May 22 00:00–06:00 May 24 01:00–03:00, 22:00–24:00 May 25 00:00–01:00 May 27 06:00–08:00 May 28 06:00–10:00 May 29 01:00–03:00 May 30 05:00–06:00 May 31 01:00–03:00
June
Jun 1 01:00–03:00 Jun 4 06:00–08:00 Jun 5 01:00–05:00, 23:00–24:00 Jun 6 00:00–03:00, 06:00–08:00 Jun 7 01:00–02:00 Jun 9 06:00–08:00 Jun 12 00:00–01:00 Jun 14 02:00–03:00 Jun 15 00:00–02:00 Jun 20 00:00–03:00, 05:00–08:00 Jun 21 01:00–03:00 Jun 22 02:00–04:00 Jun 23 06:00–08:00 Jun 24 06:00–08:00 Jun 25 22:00–24:00 Jun 26 00:00–05:00, 22:00–24:00 Jun 27 00:00–04:00 Jun 29 01:00–04:00 Jun 30 05:00–07:00
July
Jul 1 04:00–07:00 Jul 2 00:00–07:00 Jul 3 01:00–06:00 Jul 4 00:00–07:00 Jul 6 01:00–04:00 Jul 7 06:00–07:00 Jul 8 03:00–08:00 Jul 9 06:00–08:00 Jul 10 01:00–07:00, 23:00–24:00 Jul 11 00:00–02:00, 04:00–07:00 Jul 13 00:00–02:00 Jul 14 06:00–07:00 Jul 15 05:00–07:00 Jul 16 06:00–08:00 Jul 17 00:00–03:00, 05:00–07:00, 23:00–24:00 Jul 18 00:00–07:00 Jul 20 00:00–02:00 Jul 21 06:00–07:00 Jul 22 06:00–07:00 Jul 23 06:00–07:00 Jul 24 01:00–06:00, 22:00–24:00 Jul 25 00:00–06:00 Jul 27 00:00–02:00 Jul 28 06:00–07:00 Jul 29 05:00–07:00 Jul 30 05:00–07:00 Jul 31 00:00–07:00
August
Aug 1 00:00–06:00 Aug 3 00:00–01:00 Aug 4 02:00–06:00 Aug 5 06:00–07:00 Aug 7 02:00–07:00, 23:00–24:00 Aug 8 00:00–07:00 Aug 10 00:00–02:00 Aug 11 04:00–07:00 Aug 12 05:00–07:00 Aug 13 00:00–02:00, 23:00–24:00 Aug 14 00:00–03:00, 05:00–07:00 Aug 15 02:00–06:00 Aug 16 23:00–24:00 Aug 17 00:00–01:00 Aug 18 06:00–08:00 Aug 19 06:00–07:00 Aug 20 06:00–08:00, 23:00–24:00 Aug 21 00:00–05:00, 22:00–24:00 Aug 22 00:00–05:00 Aug 24 00:00–02:00 Aug 25 04:00–06:00 Aug 26 06:00–07:00 Aug 27 06:00–07:00 Aug 28 00:00–02:00, 04:00–07:00 Aug 29 00:00–07:00 Aug 31 23:00–24:00
September
Sep 1 00:00–01:00 Sep 4 02:00–07:00 Sep 5 01:00–07:00 Sep 6 01:00–03:00 Sep 7 03:00–05:00 Sep 8 06:00–07:00 Sep 9 06:00–07:00 Sep 11 00:00–06:00 Sep 12 00:00–07:00 Sep 14 06:00–08:00 Sep 15 06:00–08:00 Sep 16 05:00–07:00 Sep 17 06:00–07:00, 22:00–24:00 Sep 18 00:00–07:00 Sep 19 01:00–05:00 Sep 21 01:00–03:00 Sep 22 06:00–07:00 Sep 23 04:00–07:00, 22:00–24:00 Sep 24 00:00–06:00 Sep 25 01:00–05:00 Sep 26 00:00–05:00 Sep 29 06:00–07:00 Sep 30 06:00–07:00
October
Oct 1 00:00–06:00 Oct 2 00:00–03:00, 05:00–06:00, 23:00–24:00 Oct 3 00:00–02:00 Oct 7 06:00–08:00 Oct 8 06:00–07:00, 22:00–24:00 Oct 9 00:00–06:00 Oct 17 07:00–11:00 Oct 19 06:00–08:00 Oct 20 06:00–08:00 Oct 21 06:00–08:00 Oct 22 06:00–08:00 Oct 23 01:00–07:00 Oct 24 04:00–08:00 Oct 25 02:00–05:00 Oct 26 02:00–05:00 Oct 27 04:00–06:00 Oct 29 05:00–07:00 Oct 30 01:00–03:00, 05:00–08:00 Oct 31 08:00–10:00
November
Nov 1 03:00–05:00, 09:00–10:00 Nov 2 01:00–03:00 Nov 3 06:00–07:00 Nov 4 05:00–07:00 Nov 5 06:00–07:00 Nov 6 04:00–07:00 Nov 8 00:00–03:00 Nov 10 06:00–07:00, 23:00–24:00 Nov 11 00:00–02:00, 04:00–06:00 Nov 12 06:00–08:00, 23:00–24:00 Nov 13 00:00–07:00 Nov 14 03:00–05:00 Nov 17 06:00–07:00 Nov 18 06:00–07:00 Nov 20 06:00–07:00, 23:00–24:00 Nov 21 00:00–04:00 Nov 24 06:00–07:00 Nov 25 06:00–07:00 Nov 26 00:00–05:00 Nov 27 01:00–06:00 Nov 29 03:00–05:00
December
Dec 1 06:00–07:00 Dec 2 06:00–07:00 Dec 3 06:00–08:00 Dec 4 03:00–06:00 Dec 5 00:00–06:00 Dec 8 06:00–07:00 Dec 10 06:00–07:00 Dec 11 00:00–06:00 Dec 12 00:00–03:00 Dec 14 02:00–05:00