Most often in March, 31 days.
Highest follower count seen that year: 1,114.
January
Jan 5 07:00–13:00, 16:00–18:00 UTC Jan 6 06:00–11:00, 13:00–17:00, 19:00–22:00 UTC Jan 7 03:00–09:00, 12:00–17:00, 20:00–21:00 UTC Jan 8 05:00–12:00, 14:00–19:00, 21:00–22:00 UTC Jan 9 06:00–09:00, 12:00–14:00, 17:00–19:00, 21:00–22:00 UTC Jan 10 07:00–10:00, 15:00–22:00 UTC Jan 11 03:00–06:00, 08:00–24:00 UTC Jan 12 05:00–07:00, 09:00–11:00, 13:00–22:00 UTC Jan 13 05:00–12:00, 14:00–23:00 UTC Jan 14 00:00–01:00, 06:00–14:00, 16:00–22:00 UTC Jan 15 01:00–03:00, 06:00–08:00, 13:00–15:00, 17:00–22:00 UTC Jan 16 03:00–24:00 UTC Jan 17 00:00–03:00, 05:00–11:00, 22:00–24:00 UTC Jan 18 06:00–10:00, 13:00–19:00, 22:00–23:00 UTC Jan 19 00:00–01:00, 05:00–12:00, 14:00–16:00, 19:00–23:00 UTC Jan 20 02:00–03:00, 07:00–16:00, 19:00–21:00 UTC Jan 21 01:00–02:00, 08:00–11:00, 13:00–15:00 UTC Jan 25 13:00–20:00, 22:00–24:00 UTC Jan 26 00:00–04:00, 09:00–14:00, 16:00–21:00 UTC Jan 27 04:00–06:00, 10:00–23:00 UTC Jan 28 02:00–04:00, 11:00–12:00, 14:00–18:00, 20:00–24:00 UTC Jan 29 03:00–07:00, 11:00–21:00 UTC Jan 30 04:00–07:00, 10:00–13:00, 18:00–23:00 UTC Jan 31 00:00–04:00, 09:00–14:00, 17:00–23:00 UTC
February
Feb 1 01:00–04:00, 08:00–16:00, 20:00–24:00 UTC Feb 2 00:00–01:00, 04:00–05:00, 09:00–13:00, 15:00–20:00, 23:00–24:00 UTC Feb 3 01:00–03:00, 08:00–10:00, 13:00–14:00, 16:00–24:00 UTC Feb 4 00:00–01:00, 03:00–04:00, 11:00–12:00, 17:00–18:00, 20:00–24:00 UTC Feb 5 12:00–24:00 UTC Feb 6 00:00–03:00, 06:00–08:00, 10:00–11:00, 15:00–16:00, 18:00–24:00 UTC Feb 7 00:00–03:00, 10:00–24:00 UTC Feb 8 00:00–02:00, 07:00–09:00, 12:00–14:00, 17:00–18:00, 20:00–23:00 UTC Feb 23 09:00–10:00, 14:00–24:00 UTC Feb 24 04:00–08:00, 19:00–22:00 UTC Feb 25 08:00–14:00, 16:00–19:00, 21:00–22:00 UTC Feb 26 02:00–03:00, 05:00–08:00, 11:00–13:00, 15:00–17:00, 19:00–20:00, 22:00–23:00 UTC Feb 27 04:00–05:00, 07:00–22:00 UTC Feb 28 03:00–20:00, 23:00–24:00 UTC
March
Mar 1 02:00–04:00, 07:00–12:00, 16:00–24:00 UTC Mar 2 00:00–01:00, 06:00–07:00, 12:00–17:00, 19:00–24:00 UTC Mar 3 07:00–17:00, 19:00–24:00 UTC Mar 4 06:00–22:00 UTC Mar 5 06:00–07:00, 12:00–22:00 UTC Mar 6 08:00–11:00, 13:00–17:00, 19:00–21:00 UTC Mar 7 04:00–05:00, 07:00–21:00 UTC Mar 8 00:00–02:00, 04:00–07:00, 09:00–23:00 UTC Mar 9 05:00–20:00, 22:00–24:00 UTC Mar 10 05:00–13:00, 15:00–22:00 UTC Mar 11 01:00–04:00, 06:00–16:00, 18:00–23:00 UTC Mar 12 02:00–04:00, 06:00–12:00, 14:00–24:00 UTC Mar 13 04:00–24:00 UTC Mar 14 02:00–03:00, 06:00–17:00, 19:00–24:00 UTC Mar 15 00:00–02:00, 05:00–14:00, 17:00–20:00, 23:00–24:00 UTC Mar 16 00:00–02:00, 05:00–24:00 UTC Mar 17 03:00–23:00 UTC Mar 18 01:00–04:00, 06:00–16:00, 20:00–24:00 UTC Mar 19 00:00–10:00, 12:00–20:00 UTC Mar 20 00:00–04:00, 06:00–23:00 UTC Mar 21 01:00–03:00, 05:00–18:00, 22:00–23:00 UTC Mar 22 00:00–03:00, 06:00–16:00, 19:00–23:00 UTC Mar 23 00:00–03:00, 05:00–24:00 UTC Mar 24 01:00–03:00, 06:00–15:00, 17:00–24:00 UTC Mar 25 00:00–04:00, 06:00–07:00, 09:00–13:00, 15:00–24:00 UTC Mar 26 00:00–03:00, 06:00–08:00, 10:00–18:00, 20:00–24:00 UTC Mar 27 00:00–04:00, 06:00–08:00, 10:00–13:00, 17:00–24:00 UTC Mar 28 00:00–02:00, 04:00–13:00, 16:00–24:00 UTC Mar 29 01:00–04:00, 08:00–24:00 UTC Mar 30 00:00–04:00, 07:00–09:00, 11:00–21:00, 23:00–24:00 UTC Mar 31 00:00–02:00, 04:00–05:00, 09:00–11:00, 13:00–21:00 UTC
April
Apr 1 00:00–02:00, 05:00–07:00, 11:00–13:00, 16:00–24:00 UTC Apr 2 00:00–03:00, 07:00–08:00, 18:00–24:00 UTC Apr 3 00:00–02:00, 06:00–17:00 UTC Apr 4 01:00–02:00, 04:00–07:00, 16:00–24:00 UTC Apr 5 00:00–04:00, 07:00–24:00 UTC Apr 6 00:00–04:00, 08:00–15:00, 17:00–20:00, 23:00–24:00 UTC Apr 7 00:00–01:00, 05:00–07:00, 13:00–14:00, 17:00–20:00, 23:00–24:00 UTC Apr 8 00:00–02:00, 05:00–16:00 UTC Apr 9 00:00–03:00, 06:00–13:00, 15:00–17:00 UTC Apr 10 00:00–03:00, 08:00–09:00, 11:00–14:00, 16:00–20:00 UTC Apr 11 06:00–09:00, 14:00–24:00 UTC Apr 12 00:00–03:00, 06:00–07:00, 10:00–24:00 UTC Apr 13 00:00–03:00, 08:00–10:00, 13:00–19:00, 21:00–24:00 UTC Apr 14 00:00–03:00, 06:00–08:00, 12:00–15:00, 17:00–19:00, 21:00–24:00 UTC Apr 15 00:00–03:00, 10:00–24:00 UTC Apr 16 00:00–02:00, 08:00–10:00, 13:00–14:00, 17:00–24:00 UTC Apr 17 23:00–24:00 UTC Apr 18 00:00–04:00, 07:00–11:00, 14:00–24:00 UTC Apr 19 00:00–03:00, 08:00–09:00, 13:00–15:00, 17:00–24:00 UTC Apr 20 00:00–02:00, 06:00–08:00, 10:00–11:00, 15:00–21:00, 23:00–24:00 UTC Apr 21 00:00–03:00, 20:00–24:00 UTC Apr 22 00:00–03:00, 12:00–15:00, 17:00–24:00 UTC Apr 23 00:00–04:00, 11:00–12:00, 16:00–18:00, 20:00–24:00 UTC Apr 24 00:00–04:00, 09:00–10:00, 17:00–23:00 UTC Apr 25 00:00–07:00, 11:00–12:00, 16:00–24:00 UTC Apr 26 00:00–05:00, 11:00–15:00, 17:00–21:00 UTC Apr 27 17:00–24:00 UTC Apr 28 00:00–04:00, 11:00–12:00, 15:00–24:00 UTC Apr 29 00:00–03:00, 11:00–12:00, 15:00–21:00, 23:00–24:00 UTC Apr 30 00:00–03:00, 09:00–11:00, 14:00–21:00, 23:00–24:00 UTC
May
May 1 00:00–06:00, 13:00–24:00 UTC May 2 00:00–03:00 UTC May 3 00:00–04:00, 09:00–10:00 UTC May 4 16:00–20:00, 22:00–24:00 UTC May 5 00:00–04:00, 08:00–09:00, 13:00–20:00, 23:00–24:00 UTC May 6 00:00–02:00, 05:00–09:00, 11:00–12:00, 18:00–24:00 UTC May 7 00:00–03:00, 06:00–11:00, 14:00–21:00 UTC May 8 05:00–07:00, 13:00–15:00, 17:00–21:00, 23:00–24:00 UTC May 9 00:00–01:00, 06:00–09:00, 11:00–12:00, 16:00–23:00 UTC May 10 00:00–02:00, 05:00–06:00, 16:00–24:00 UTC May 11 00:00–02:00, 10:00–24:00 UTC May 12 00:00–02:00, 05:00–07:00, 11:00–13:00, 16:00–24:00 UTC May 13 03:00–07:00, 11:00–13:00, 17:00–18:00, 22:00–24:00 UTC May 14 00:00–01:00, 03:00–05:00, 15:00–16:00, 19:00–23:00 UTC May 15 03:00–04:00, 08:00–09:00, 17:00–23:00 UTC May 16 01:00–02:00, 04:00–08:00, 11:00–12:00, 14:00–16:00, 18:00–24:00 UTC May 17 00:00–02:00, 05:00–09:00, 13:00–16:00, 19:00–24:00 UTC May 18 01:00–07:00, 10:00–11:00, 15:00–22:00 UTC May 19 00:00–02:00, 05:00–06:00, 18:00–22:00 UTC May 20 00:00–06:00, 09:00–13:00, 15:00–20:00 UTC May 21 04:00–07:00, 09:00–10:00, 17:00–20:00 UTC May 22 02:00–04:00, 06:00–10:00, 14:00–21:00 UTC May 23 00:00–02:00, 05:00–11:00, 13:00–18:00, 23:00–24:00 UTC May 24 03:00–07:00, 09:00–12:00, 15:00–18:00, 20:00–24:00 UTC May 25 00:00–06:00, 08:00–09:00, 11:00–12:00, 14:00–15:00, 22:00–24:00 UTC May 26 00:00–03:00, 09:00–10:00, 15:00–19:00, 23:00–24:00 UTC May 27 00:00–02:00, 04:00–08:00, 12:00–23:00 UTC May 28 00:00–07:00, 11:00–12:00, 15:00–22:00 UTC May 29 00:00–07:00, 13:00–14:00, 17:00–24:00 UTC May 30 00:00–12:00, 14:00–15:00, 17:00–24:00 UTC May 31 03:00–06:00, 08:00–09:00, 12:00–24:00 UTC
June
Jun 1 00:00–09:00, 12:00–15:00, 17:00–18:00 UTC Jun 3 21:00–24:00 UTC Jun 4 11:00–14:00, 17:00–20:00, 23:00–24:00 UTC Jun 5 03:00–04:00, 06:00–08:00, 14:00–15:00, 18:00–21:00, 23:00–24:00 UTC Jun 6 04:00–06:00, 10:00–11:00, 17:00–18:00 UTC Jun 7 12:00–13:00, 16:00–17:00, 20:00–23:00 UTC Jun 8 04:00–05:00, 14:00–16:00, 18:00–24:00 UTC Jun 9 00:00–04:00, 15:00–17:00 UTC Jun 10 07:00–08:00 UTC Jun 11 06:00–07:00, 09:00–10:00, 12:00–13:00, 19:00–20:00 UTC Jun 12 12:00–15:00, 17:00–18:00 UTC Jun 13 02:00–03:00, 12:00–13:00, 15:00–16:00 UTC Jun 15 06:00–07:00, 12:00–13:00, 15:00–16:00, 18:00–20:00, 23:00–24:00 UTC Jun 16 00:00–01:00 UTC Jun 17 18:00–20:00 UTC Jun 18 03:00–04:00, 11:00–15:00, 20:00–21:00 UTC Jun 19 05:00–07:00, 13:00–14:00, 18:00–21:00 UTC Jun 20 03:00–05:00, 12:00–13:00, 16:00–20:00 UTC Jun 21 01:00–02:00, 05:00–07:00, 10:00–11:00 UTC Jun 22 19:00–20:00 UTC Jun 24 10:00–11:00, 20:00–21:00 UTC Jun 25 05:00–06:00, 11:00–12:00, 19:00–20:00 UTC Jun 26 03:00–06:00, 10:00–12:00, 18:00–19:00, 22:00–23:00 UTC Jun 27 11:00–12:00 UTC Jun 28 04:00–05:00, 23:00–24:00 UTC Jun 29 11:00–12:00, 15:00–16:00, 18:00–19:00 UTC Jun 30 02:00–03:00, 09:00–10:00 UTC
July
Jul 1 07:00–09:00 UTC Jul 2 07:00–11:00 UTC Jul 4 02:00–03:00, 09:00–10:00 UTC Jul 5 09:00–10:00 UTC Jul 6 07:00–08:00 UTC