Most often in February, 28 days.
Highest follower count seen that year: 2,833.
January
Jan 9 14:00–19:00 Jan 10 03:00–06:00, 17:00–19:00 Jan 11 10:00–14:00 Jan 12 12:00–14:00, 19:00–21:00 Jan 13 06:00–10:00, 14:00–19:00 Jan 14 03:00–05:00, 08:00–09:00, 14:00–18:00 Jan 15 12:00–15:00 Jan 16 08:00–10:00, 15:00–17:00 Jan 17 18:00–20:00 Jan 18 06:00–09:00, 17:00–19:00 Jan 19 18:00–19:00 Jan 20 09:00–15:00, 21:00–22:00 Jan 21 06:00–08:00, 13:00–14:00, 18:00–19:00 Jan 22 05:00–08:00 Jan 27 18:00–20:00 Jan 28 03:00–05:00, 11:00–12:00, 18:00–19:00 Jan 29 03:00–08:00, 13:00–17:00 Jan 30 06:00–08:00, 11:00–19:00 Jan 31 07:00–12:00
February
Feb 1 17:00–18:00 Feb 2 02:00–05:00, 11:00–13:00, 19:00–21:00 Feb 3 04:00–08:00, 16:00–18:00 Feb 4 10:00–13:00 Feb 5 03:00–04:00, 10:00–18:00 Feb 6 07:00–09:00 Feb 7 16:00–17:00 Feb 8 14:00–18:00 Feb 9 06:00–08:00, 18:00–20:00 Feb 10 07:00–08:00 Feb 11 10:00–19:00 Feb 12 02:00–03:00, 07:00–09:00, 19:00–21:00 Feb 13 18:00–21:00 Feb 14 11:00–17:00 Feb 15 10:00–14:00, 16:00–18:00 Feb 16 02:00–04:00, 09:00–17:00 Feb 17 07:00–08:00, 14:00–15:00, 17:00–19:00 Feb 18 07:00–08:00, 17:00–19:00 Feb 19 04:00–06:00, 09:00–11:00 Feb 20 10:00–15:00, 18:00–19:00 Feb 21 04:00–05:00, 07:00–09:00, 11:00–12:00, 18:00–19:00 Feb 22 05:00–07:00 Feb 23 14:00–17:00 Feb 24 06:00–08:00 Feb 25 05:00–07:00, 09:00–11:00, 14:00–16:00 Feb 26 12:00–15:00, 17:00–18:00 Feb 27 06:00–09:00, 16:00–18:00 Feb 28 13:00–17:00
March
Mar 1 10:00–12:00 Mar 2 15:00–17:00 Mar 3 07:00–17:00 Mar 4 07:00–11:00, 14:00–19:00 Mar 5 03:00–04:00, 13:00–17:00 Mar 6 08:00–15:00, 18:00–20:00 Mar 7 06:00–09:00, 16:00–18:00 Mar 9 10:00–15:00 Mar 10 05:00–06:00, 08:00–09:00, 14:00–17:00, 21:00–23:00 Mar 11 06:00–07:00, 09:00–13:00, 18:00–21:00 Mar 12 06:00–08:00 Mar 13 12:00–15:00, 17:00–18:00 Mar 14 05:00–07:00, 10:00–16:00 Mar 15 03:00–07:00, 11:00–16:00 Mar 16 09:00–13:00, 22:00–23:00 Mar 17 07:00–12:00, 19:00–22:00 Mar 18 06:00–08:00, 11:00–12:00, 16:00–17:00 Mar 19 16:00–18:00 Mar 20 10:00–13:00 Mar 21 02:00–04:00 Mar 23 08:00–09:00 Mar 24 18:00–19:00 Mar 30 03:00–04:00, 10:00–11:00 Mar 31 09:00–10:00, 12:00–13:00
April
Apr 1 06:00–07:00, 13:00–14:00, 18:00–20:00 Apr 2 05:00–07:00, 11:00–13:00, 18:00–20:00 Apr 3 06:00–07:00 Apr 4 10:00–13:00 Apr 7 05:00–09:00, 13:00–17:00 Apr 8 04:00–05:00, 07:00–08:00, 14:00–16:00 Apr 9 14:00–15:00 Apr 10 07:00–09:00 Apr 13 08:00–10:00, 12:00–13:00, 21:00–23:00 Apr 14 08:00–14:00 Apr 15 13:00–15:00 Apr 16 06:00–08:00, 12:00–14:00, 18:00–19:00 Apr 17 05:00–06:00, 12:00–14:00 Apr 20 11:00–14:00, 18:00–20:00 Apr 21 02:00–04:00, 18:00–20:00 Apr 22 03:00–04:00, 12:00–14:00 Apr 24 07:00–08:00, 12:00–14:00 Apr 25 10:00–11:00, 21:00–24:00 Apr 26 06:00–08:00, 11:00–12:00 Apr 27 06:00–08:00, 14:00–15:00, 20:00–21:00 Apr 28 06:00–10:00, 19:00–21:00 Apr 29 06:00–08:00 Apr 30 13:00–14:00, 19:00–24:00
May
May 3 16:00–17:00 May 5 11:00–13:00, 18:00–21:00 May 6 21:00–23:00 May 7 19:00–20:00 May 9 08:00–09:00, 11:00–13:00 May 12 16:00–22:00 May 13 07:00–09:00, 11:00–12:00, 17:00–23:00 May 14 22:00–24:00 May 15 08:00–10:00, 15:00–16:00, 20:00–23:00 May 16 14:00–16:00, 21:00–23:00 May 17 09:00–11:00 May 18 18:00–19:00 May 20 19:00–22:00 May 22 02:00–04:00, 22:00–23:00 May 23 07:00–08:00 May 24 09:00–11:00 May 28 18:00–19:00 May 31 21:00–23:00
June
Jun 1 08:00–11:00, 13:00–14:00, 19:00–21:00 Jun 3 18:00–20:00 Jun 4 05:00–06:00, 20:00–22:00 Jun 5 09:00–14:00, 21:00–23:00 Jun 6 09:00–11:00, 17:00–19:00 Jun 8 06:00–07:00 Jun 9 20:00–24:00 Jun 10 07:00–09:00, 16:00–20:00 Jun 11 07:00–09:00, 18:00–23:00 Jun 12 07:00–12:00 Jun 13 07:00–11:00, 17:00–18:00 Jun 15 23:00–24:00 Jun 16 00:00–01:00 Jun 17 10:00–12:00, 18:00–21:00 Jun 18 05:00–07:00, 14:00–19:00 Jun 19 10:00–14:00 Jun 20 15:00–17:00, 19:00–22:00 Jun 21 18:00–19:00 Jun 24 07:00–08:00, 10:00–14:00, 18:00–20:00 Jun 25 07:00–11:00, 19:00–22:00 Jun 26 06:00–07:00, 11:00–13:00 Jun 27 13:00–14:00 Jun 28 04:00–05:00, 10:00–11:00, 19:00–20:00 Jun 29 06:00–07:00, 10:00–12:00, 23:00–24:00 Jun 30 08:00–09:00, 20:00–22:00
July
Jul 1 07:00–08:00, 13:00–15:00, 18:00–23:00 Jul 2 05:00–10:00, 14:00–15:00, 17:00–19:00 Jul 3 04:00–08:00, 19:00–23:00 Jul 4 07:00–12:00, 16:00–20:00 Jul 5 04:00–09:00, 12:00–20:00 Jul 6 18:00–23:00 Jul 7 10:00–12:00, 21:00–24:00 Jul 8 18:00–20:00 Jul 10 00:00–01:00, 09:00–13:00, 18:00–19:00, 21:00–23:00 Jul 11 09:00–10:00, 16:00–19:00 Jul 12 04:00–06:00, 16:00–19:00 Jul 13 06:00–09:00, 16:00–23:00 Jul 14 07:00–10:00, 12:00–13:00, 16:00–17:00 Jul 15 20:00–22:00 Jul 16 13:00–14:00, 18:00–19:00 Jul 17 09:00–11:00, 15:00–17:00, 20:00–22:00 Jul 19 17:00–18:00 Jul 21 05:00–06:00, 19:00–20:00 Jul 22 02:00–05:00, 13:00–16:00 Jul 23 02:00–05:00, 18:00–24:00 Jul 24 00:00–01:00, 05:00–07:00, 14:00–15:00 Jul 25 21:00–22:00 Jul 26 14:00–16:00, 20:00–23:00 Jul 27 06:00–07:00, 09:00–11:00, 14:00–15:00