Most often in January, 31 days.
Highest follower count seen that year: 4,852.
January
Jan 1 02:00–03:00, 07:00–11:00, 13:00–23:00 Jan 2 18:00–21:00 Jan 3 08:00–09:00, 13:00–14:00, 22:00–24:00 Jan 4 00:00–02:00, 11:00–13:00 Jan 5 23:00–24:00 Jan 6 00:00–04:00, 22:00–24:00 Jan 7 00:00–04:00, 08:00–11:00, 23:00–24:00 Jan 8 00:00–04:00, 07:00–08:00 Jan 9 00:00–06:00, 10:00–13:00, 22:00–24:00 Jan 10 00:00–08:00, 10:00–13:00 Jan 11 03:00–05:00, 07:00–08:00 Jan 12 00:00–04:00, 09:00–14:00 Jan 13 00:00–08:00, 17:00–18:00 Jan 14 02:00–05:00 Jan 15 05:00–08:00, 11:00–20:00, 22:00–23:00 Jan 16 06:00–09:00, 14:00–15:00 Jan 17 02:00–05:00 Jan 18 04:00–08:00, 11:00–12:00, 19:00–20:00 Jan 19 21:00–23:00 Jan 20 00:00–01:00, 08:00–10:00 Jan 21 06:00–08:00, 18:00–23:00 Jan 22 06:00–07:00 Jan 23 00:00–03:00 Jan 24 02:00–03:00, 11:00–15:00 Jan 25 12:00–14:00 Jan 26 18:00–20:00 Jan 27 02:00–07:00, 09:00–10:00, 22:00–23:00 Jan 28 00:00–06:00, 12:00–13:00 Jan 29 01:00–07:00 Jan 30 00:00–04:00, 06:00–07:00, 17:00–18:00 Jan 31 00:00–01:00, 05:00–11:00, 14:00–16:00
February
Feb 1 23:00–24:00 Feb 2 00:00–07:00 Feb 3 06:00–08:00, 16:00–24:00 Feb 7 16:00–17:00 Feb 8 11:00–16:00 Feb 9 06:00–16:00 Feb 10 05:00–09:00 Feb 11 11:00–13:00 Feb 14 10:00–12:00
March
Mar 15 23:00–24:00 Mar 16 00:00–04:00 Mar 21 15:00–19:00 Mar 22 02:00–08:00, 20:00–24:00 Mar 23 00:00–03:00, 16:00–19:00 Mar 24 06:00–11:00
May
May 1 15:00–18:00 May 2 01:00–02:00, 15:00–16:00 May 3 23:00–24:00 May 4 00:00–02:00, 06:00–08:00 May 5 11:00–14:00, 23:00–24:00 May 6 00:00–03:00, 18:00–24:00 May 7 00:00–04:00, 06:00–07:00 May 8 22:00–24:00 May 9 00:00–01:00, 21:00–22:00 May 11 01:00–06:00, 09:00–11:00, 21:00–22:00 May 12 01:00–05:00, 12:00–13:00, 22:00–24:00 May 13 06:00–08:00 May 14 04:00–11:00 May 15 04:00–10:00, 19:00–20:00 May 16 03:00–10:00 May 17 01:00–07:00, 18:00–19:00 May 18 01:00–07:00, 14:00–16:00 May 19 02:00–06:00 May 20 07:00–09:00, 14:00–22:00 May 21 05:00–07:00, 09:00–10:00, 21:00–22:00 May 22 06:00–07:00, 10:00–13:00, 23:00–24:00 May 23 00:00–01:00, 23:00–24:00 May 24 10:00–12:00, 17:00–19:00, 21:00–24:00 May 25 03:00–04:00, 17:00–19:00, 23:00–24:00 May 26 00:00–01:00, 03:00–05:00, 18:00–20:00 May 27 00:00–01:00, 03:00–07:00 May 28 15:00–19:00 May 29 00:00–01:00, 18:00–21:00 May 30 01:00–02:00, 06:00–07:00 May 31 00:00–05:00, 10:00–11:00, 19:00–22:00
June
Jun 1 02:00–09:00, 18:00–19:00 Jun 2 03:00–08:00, 10:00–16:00, 23:00–24:00 Jun 3 00:00–02:00, 11:00–13:00 Jun 4 09:00–10:00, 23:00–24:00 Jun 5 01:00–05:00, 07:00–08:00, 10:00–12:00 Jun 6 03:00–04:00, 13:00–19:00 Jun 7 03:00–06:00 Jun 8 07:00–10:00, 17:00–18:00 Jun 9 11:00–13:00, 19:00–22:00 Jun 10 06:00–07:00, 14:00–15:00, 19:00–21:00 Jun 11 01:00–03:00, 08:00–11:00, 17:00–19:00 Jun 12 10:00–12:00, 18:00–19:00, 22:00–24:00 Jun 13 00:00–01:00, 08:00–12:00 Jun 15 11:00–13:00, 15:00–19:00, 22:00–24:00 Jun 16 00:00–08:00, 13:00–14:00 Jun 17 14:00–15:00, 22:00–24:00 Jun 18 03:00–04:00, 17:00–24:00 Jun 19 00:00–04:00, 15:00–17:00 Jun 20 00:00–01:00, 04:00–05:00, 23:00–24:00 Jun 21 00:00–08:00, 21:00–22:00 Jun 22 02:00–12:00, 23:00–24:00 Jun 23 04:00–06:00 Jun 24 02:00–10:00, 18:00–19:00 Jun 25 02:00–06:00 Jun 26 01:00–03:00, 05:00–10:00 Jun 27 04:00–09:00, 15:00–16:00 Jun 28 12:00–14:00, 19:00–23:00 Jun 29 09:00–15:00 Jun 30 08:00–09:00, 16:00–20:00
July
Jul 1 00:00–02:00, 09:00–13:00, 21:00–22:00 Jul 2 08:00–12:00 Jul 3 10:00–15:00, 18:00–19:00 Jul 4 03:00–07:00, 16:00–21:00 Jul 5 02:00–06:00, 21:00–24:00 Jul 6 00:00–01:00, 23:00–24:00 Jul 7 00:00–01:00, 19:00–24:00 Jul 8 00:00–09:00 Jul 9 01:00–10:00, 18:00–23:00 Jul 10 04:00–07:00, 22:00–23:00 Jul 11 23:00–24:00 Jul 12 02:00–07:00, 17:00–19:00, 22:00–24:00 Jul 13 00:00–02:00, 04:00–08:00, 20:00–24:00 Jul 14 00:00–01:00 Jul 16 02:00–04:00 Jul 17 01:00–06:00 Jul 18 06:00–08:00, 10:00–12:00, 18:00–19:00 Jul 19 00:00–08:00, 12:00–14:00, 23:00–24:00 Jul 20 00:00–02:00, 06:00–09:00, 22:00–23:00 Jul 21 03:00–06:00 Jul 22 07:00–10:00, 14:00–16:00, 21:00–22:00 Jul 23 01:00–03:00, 15:00–16:00, 18:00–20:00 Jul 24 01:00–05:00, 19:00–21:00 Jul 25 14:00–17:00 Jul 26 19:00–24:00 Jul 27 00:00–02:00, 05:00–06:00, 09:00–10:00, 11:00–12:00, 13:00–15:00