Most often in May, 31 days.
Highest follower count seen that year: 4,890.
January
Jan 1 08:00–14:00, 17:00–18:00 Jan 2 04:00–14:00 Jan 3 06:00–09:00, 11:00–19:00 Jan 4 06:00–12:00, 15:00–19:00 Jan 5 07:00–08:00, 11:00–20:00 Jan 6 07:00–19:00 Jan 7 09:00–10:00, 13:00–21:00 Jan 8 05:00–13:00 Jan 9 09:00–13:00 Jan 10 05:00–12:00, 14:00–20:00 Jan 11 05:00–13:00 Jan 12 08:00–19:00 Jan 13 05:00–16:00 Jan 14 07:00–16:00 Jan 15 07:00–14:00, 16:00–20:00 Jan 16 04:00–16:00 Jan 17 05:00–16:00 Jan 18 07:00–10:00, 14:00–18:00 Jan 19 12:00–20:00 Jan 20 05:00–15:00 Jan 21 07:00–16:00 Jan 22 06:00–13:00 Jan 23 05:00–12:00, 15:00–18:00 Jan 24 07:00–12:00, 14:00–18:00 Jan 25 04:00–12:00 Jan 26 04:00–16:00 Jan 27 07:00–16:00 Jan 28 05:00–08:00, 10:00–18:00 Jan 29 05:00–14:00 Jan 30 03:00–13:00 Jan 31 04:00–13:00
February
Feb 1 04:00–16:00 Feb 2 04:00–16:00 Feb 3 05:00–14:00 Feb 4 03:00–04:00, 10:00–13:00 Feb 5 10:00–15:00 Feb 6 07:00–13:00, 15:00–16:00 Feb 7 03:00–14:00 Feb 8 07:00–11:00, 13:00–18:00 Feb 9 05:00–14:00 Feb 10 06:00–18:00 Feb 11 06:00–07:00, 09:00–17:00 Feb 12 04:00–16:00 Feb 13 04:00–14:00 Feb 14 06:00–12:00, 14:00–16:00 Feb 15 07:00–14:00 Feb 16 05:00–16:00 Feb 17 06:00–14:00, 17:00–18:00 Feb 18 05:00–06:00, 12:00–18:00 Feb 19 04:00–12:00 Feb 20 02:00–13:00 Feb 21 03:00–15:00 Feb 22 02:00–10:00, 12:00–14:00 Feb 23 04:00–16:00 Feb 24 04:00–12:00, 14:00–17:00 Feb 25 04:00–13:00, 15:00–17:00 Feb 26 02:00–14:00 Feb 27 02:00–11:00, 13:00–18:00 Feb 28 02:00–11:00, 14:00–17:00
March
Mar 1 05:00–17:00 Mar 2 00:00–09:00, 12:00–19:00 Mar 3 04:00–05:00, 07:00–14:00 Mar 4 04:00–12:00 Mar 5 01:00–11:00 Mar 6 02:00–04:00, 09:00–11:00, 14:00–19:00 Mar 7 06:00–14:00 Mar 8 05:00–13:00 Mar 9 05:00–13:00 Mar 10 02:00–14:00 Mar 11 04:00–13:00 Mar 12 04:00–13:00 Mar 13 05:00–09:00 Mar 14 07:00–14:00 Mar 15 04:00–12:00 Mar 16 04:00–13:00 Mar 17 05:00–13:00 Mar 18 07:00–09:00, 14:00–19:00 Mar 19 04:00–12:00, 14:00–16:00 Mar 20 05:00–16:00 Mar 21 04:00–06:00 Mar 22 05:00–16:00 Mar 23 03:00–10:00, 13:00–17:00 Mar 24 05:00–15:00 Mar 25 06:00–16:00 Mar 26 05:00–14:00 Mar 27 04:00–13:00, 17:00–19:00 Mar 28 05:00–14:00 Mar 29 05:00–16:00 Mar 30 06:00–16:00 Mar 31 03:00–17:00
April
Apr 1 03:00–14:00 Apr 2 07:00–21:00 Apr 3 03:00–10:00, 14:00–17:00 Apr 4 03:00–17:00 Apr 5 05:00–14:00 Apr 6 03:00–15:00 Apr 7 03:00–04:00, 06:00–16:00 Apr 8 02:00–08:00, 14:00–18:00 Apr 9 06:00–15:00 Apr 10 05:00–15:00, 17:00–19:00 Apr 11 04:00–13:00, 16:00–19:00 Apr 12 04:00–12:00 Apr 13 06:00–12:00, 14:00–16:00 Apr 14 08:00–17:00 Apr 15 05:00–12:00 Apr 16 03:00–12:00, 14:00–17:00 Apr 17 04:00–05:00, 11:00–16:00 Apr 18 03:00–13:00, 16:00–18:00 Apr 19 06:00–17:00 Apr 20 02:00–13:00 Apr 21 12:00–13:00, 17:00–20:00 Apr 22 03:00–11:00, 13:00–18:00 Apr 23 03:00–14:00 Apr 24 05:00–14:00 Apr 25 04:00–14:00 Apr 26 04:00–15:00 Apr 27 04:00–14:00 Apr 28 02:00–15:00 Apr 29 03:00–13:00 Apr 30 01:00–13:00
May
May 1 03:00–07:00, 12:00–13:00 May 2 11:00–12:00 May 3 04:00–13:00, 16:00–20:00 May 4 05:00–13:00 May 5 03:00–09:00, 14:00–19:00 May 6 04:00–16:00 May 7 04:00–17:00 May 8 02:00–03:00, 07:00–15:00 May 9 03:00–04:00, 06:00–10:00, 12:00–13:00, 15:00–16:00 May 10 04:00–12:00 May 11 04:00–11:00, 13:00–16:00 May 12 02:00–15:00 May 13 04:00–14:00 May 14 04:00–13:00, 16:00–17:00 May 15 05:00–11:00, 13:00–14:00 May 16 05:00–08:00, 10:00–17:00 May 17 07:00–15:00 May 18 08:00–14:00, 18:00–20:00 May 19 05:00–12:00 May 20 03:00–13:00 May 21 05:00–13:00 May 22 03:00–06:00, 13:00–18:00 May 23 03:00–12:00 May 24 06:00–19:00 May 25 04:00–12:00, 14:00–19:00 May 26 03:00–13:00, 17:00–19:00 May 27 03:00–15:00 May 28 06:00–13:00, 15:00–19:00 May 29 04:00–16:00 May 30 05:00–14:00 May 31 06:00–15:00
June
Jun 1 06:00–18:00 Jun 2 04:00–13:00 Jun 3 06:00–07:00, 09:00–14:00 Jun 4 04:00–12:00, 14:00–21:00 Jun 5 07:00–17:00 Jun 6 03:00–14:00, 17:00–20:00 Jun 7 05:00–12:00, 15:00–21:00 Jun 8 03:00–11:00, 15:00–17:00 Jun 9 03:00–10:00, 13:00–16:00 Jun 10 07:00–13:00, 17:00–20:00 Jun 11 06:00–12:00, 18:00–20:00 Jun 12 03:00–14:00 Jun 13 03:00–12:00 Jun 15 04:00–13:00, 23:00–24:00 Jun 16 00:00–06:00, 11:00–17:00 Jun 17 04:00–10:00, 13:00–18:00 Jun 18 03:00–12:00, 14:00–15:00 Jun 19 04:00–07:00, 09:00–12:00 Jun 20 10:00–16:00 Jun 21 04:00–18:00 Jun 22 06:00–15:00 Jun 23 05:00–13:00 Jun 24 05:00–17:00 Jun 25 07:00–18:00 Jun 26 07:00–14:00 Jun 27 04:00–08:00, 11:00–15:00 Jun 28 04:00–08:00, 10:00–14:00 Jun 29 04:00–18:00 Jun 30 04:00–05:00, 07:00–12:00, 14:00–17:00
July
Jul 1 07:00–12:00 Jul 2 06:00–08:00, 14:00–15:00, 17:00–18:00 Jul 3 05:00–14:00, 19:00–20:00 Jul 4 05:00–19:00 Jul 5 04:00–14:00, 19:00–21:00 Jul 6 05:00–06:00, 08:00–09:00, 13:00–15:00 Jul 7 02:00–11:00, 16:00–17:00 Jul 8 04:00–13:00 Jul 9 06:00–12:00 Jul 10 04:00–09:00, 13:00–15:00, 17:00–20:00 Jul 11 04:00–13:00, 15:00–20:00 Jul 12 04:00–08:00, 10:00–19:00 Jul 13 04:00–14:00 Jul 14 03:00–18:00 Jul 15 08:00–09:00, 12:00–16:00 Jul 16 04:00–10:00, 12:00–15:00 Jul 17 07:00–18:00 Jul 18 06:00–13:00, 15:00–16:00 Jul 19 04:00–14:00 Jul 20 04:00–17:00, 19:00–20:00 Jul 21 08:00–09:00, 11:00–18:00 Jul 22 05:00–06:00, 11:00–18:00 Jul 23 10:00–13:00, 15:00–20:00 Jul 24 05:00–17:00 Jul 25 04:00–05:00, 11:00–12:00, 16:00–20:00 Jul 26 03:00–04:00, 07:00–09:00, 15:00–16:00, 18:00–19:00 Jul 27 05:00–06:00, 07:00–09:00, 11:00–12:00