Most often in June, 28 days.
Highest follower count seen that year: 17,292.
January
Jan 1 05:00–07:00, 09:00–13:00, 15:00–17:00 Jan 2 08:00–12:00, 14:00–16:00 Jan 3 05:00–07:00 Jan 4 04:00–07:00, 14:00–18:00 Jan 5 14:00–19:00 Jan 6 06:00–09:00 Jan 7 12:00–15:00 Jan 8 11:00–14:00 Jan 10 06:00–10:00, 18:00–22:00 Jan 12 05:00–10:00, 16:00–18:00 Jan 13 17:00–20:00 Jan 14 08:00–10:00, 17:00–19:00 Jan 15 06:00–08:00, 15:00–18:00 Jan 16 05:00–10:00 Jan 17 06:00–10:00, 14:00–16:00 Jan 19 07:00–15:00 Jan 24 16:00–18:00 Jan 27 14:00–18:00 Jan 29 04:00–08:00, 16:00–18:00 Jan 30 04:00–07:00 Jan 31 05:00–08:00
February
Feb 1 02:00–08:00, 15:00–17:00 Feb 2 06:00–07:00 Feb 3 15:00–19:00 Feb 4 05:00–08:00, 16:00–20:00 Feb 7 06:00–08:00 Feb 8 15:00–18:00 Feb 9 16:00–18:00 Feb 10 16:00–20:00 Feb 12 16:00–20:00 Feb 13 17:00–19:00 Feb 14 17:00–20:00 Feb 15 05:00–08:00 Feb 17 15:00–20:00 Feb 19 05:00–07:00, 14:00–16:00 Feb 20 05:00–09:00, 15:00–20:00 Feb 21 17:00–23:00 Feb 22 09:00–11:00, 16:00–21:00 Feb 23 16:00–18:00 Feb 24 15:00–21:00 Feb 26 10:00–15:00 Feb 27 04:00–08:00 Feb 28 07:00–09:00, 14:00–22:00
March
Mar 1 06:00–08:00, 17:00–21:00 Mar 2 07:00–11:00, 15:00–17:00 Mar 4 05:00–09:00, 17:00–22:00 Mar 5 09:00–13:00, 17:00–22:00 Mar 6 06:00–10:00, 22:00–24:00 Mar 7 22:00–24:00 Mar 8 00:00–02:00, 04:00–09:00, 22:00–24:00 Mar 9 00:00–01:00, 22:00–24:00 Mar 10 00:00–07:00, 23:00–24:00 Mar 11 00:00–09:00, 15:00–17:00 Mar 12 04:00–10:00, 23:00–24:00 Mar 13 03:00–06:00 Mar 14 14:00–18:00 Mar 15 14:00–19:00 Mar 16 10:00–13:00 Mar 17 13:00–17:00 Mar 18 15:00–21:00 Mar 19 09:00–13:00 Mar 20 01:00–07:00 Mar 22 06:00–09:00, 18:00–19:00, 21:00–22:00 Mar 23 14:00–16:00 Mar 25 15:00–18:00 Mar 27 05:00–10:00, 23:00–24:00 Mar 28 00:00–06:00 Mar 29 00:00–06:00 Mar 31 05:00–10:00
April
Apr 1 04:00–08:00, 16:00–22:00 Apr 3 13:00–18:00 Apr 4 06:00–11:00 Apr 5 05:00–08:00, 14:00–17:00 Apr 6 05:00–07:00, 14:00–16:00 Apr 8 05:00–08:00 Apr 9 04:00–14:00 Apr 11 05:00–10:00, 15:00–23:00 Apr 13 15:00–19:00 Apr 15 14:00–20:00 Apr 16 04:00–06:00, 23:00–24:00 Apr 17 00:00–07:00, 09:00–17:00 Apr 18 05:00–07:00 Apr 20 16:00–17:00, 19:00–20:00 Apr 21 18:00–22:00 Apr 23 18:00–24:00 Apr 26 06:00–13:00, 15:00–16:00 Apr 28 06:00–07:00 Apr 29 05:00–06:00, 23:00–24:00 Apr 30 00:00–06:00
May
May 1 04:00–07:00, 16:00–18:00 May 3 13:00–16:00 May 4 16:00–21:00 May 5 13:00–14:00 May 7 17:00–22:00 May 8 06:00–07:00, 09:00–10:00, 17:00–23:00 May 9 15:00–16:00 May 11 18:00–22:00 May 12 20:00–24:00 May 13 00:00–04:00 May 14 02:00–05:00 May 18 14:00–15:00 May 20 05:00–07:00, 14:00–19:00 May 22 02:00–08:00, 15:00–21:00 May 23 06:00–09:00, 14:00–19:00 May 24 10:00–16:00 May 25 15:00–17:00 May 26 15:00–21:00 May 27 23:00–24:00 May 28 00:00–04:00, 16:00–22:00 May 29 08:00–14:00, 16:00–19:00 May 30 17:00–19:00 May 31 20:00–24:00
June
Jun 1 00:00–06:00 Jun 2 19:00–20:00 Jun 3 19:00–21:00 Jun 4 22:00–24:00 Jun 5 00:00–03:00, 23:00–24:00 Jun 6 00:00–04:00 Jun 7 01:00–06:00, 23:00–24:00 Jun 8 00:00–02:00, 23:00–24:00 Jun 9 00:00–02:00 Jun 10 00:00–01:00 Jun 11 00:00–03:00, 06:00–11:00 Jun 12 02:00–03:00, 06:00–11:00 Jun 13 02:00–06:00 Jun 15 02:00–04:00 Jun 16 02:00–09:00 Jun 17 03:00–07:00 Jun 18 04:00–08:00 Jun 19 00:00–05:00 Jun 20 16:00–19:00 Jun 21 04:00–11:00 Jun 22 04:00–11:00 Jun 23 04:00–10:00 Jun 24 04:00–06:00, 15:00–23:00 Jun 26 06:00–10:00 Jun 27 04:00–08:00 Jun 28 12:00–14:00 Jun 29 05:00–10:00 Jun 30 18:00–22:00
July
Jul 1 08:00–13:00, 18:00–23:00 Jul 2 08:00–09:00, 21:00–24:00 Jul 3 00:00–04:00, 15:00–20:00 Jul 4 07:00–09:00, 18:00–21:00 Jul 5 15:00–22:00 Jul 6 08:00–13:00 Jul 7 05:00–09:00, 14:00–17:00 Jul 8 04:00–05:00, 15:00–21:00 Jul 9 04:00–06:00 Jul 10 06:00–09:00, 16:00–18:00 Jul 11 22:00–24:00 Jul 12 00:00–03:00 Jul 14 16:00–19:00 Jul 16 15:00–18:00 Jul 17 04:00–06:00 Jul 18 04:00–05:00, 15:00–21:00 Jul 19 16:00–21:00 Jul 20 04:00–07:00, 17:00–19:00 Jul 21 09:00–11:00 Jul 22 05:00–11:00, 18:00–21:00 Jul 24 17:00–21:00 Jul 25 11:00–15:00 Jul 26 09:00–13:00, 16:00–21:00 Jul 27 18:00–21:00 Jul 28 16:00–20:00 Jul 29 07:00–09:00, 17:00–20:00 Jul 30 05:00–11:00, 16:00–21:00
August
Aug 1 13:00–16:00 Aug 2 12:00–23:00 Aug 3 05:00–06:00 Aug 4 20:00–24:00 Aug 5 00:00–01:00, 11:00–15:00 Aug 6 01:00–02:00, 15:00–19:00 Aug 7 05:00–10:00, 19:00–23:00 Aug 8 15:00–20:00 Aug 9 14:00–18:00 Aug 10 04:00–08:00, 14:00–16:00 Aug 11 16:00–21:00 Aug 12 13:00–15:00, 21:00–24:00 Aug 13 00:00–08:00, 18:00–24:00 Aug 14 22:00–24:00 Aug 15 00:00–03:00, 21:00–23:00 Aug 17 05:00–13:00 Aug 18 06:00–11:00, 22:00–24:00 Aug 19 00:00–04:00 Aug 20 05:00–08:00 Aug 21 13:00–19:00 Aug 22 13:00–20:00 Aug 24 16:00–21:00 Aug 25 14:00–21:00 Aug 26 06:00–09:00 Aug 27 04:00–07:00, 16:00–22:00 Aug 29 05:00–08:00 Aug 30 17:00–19:00
September
Sep 7 17:00–21:00 Sep 9 04:00–16:00 Sep 10 17:00–22:00 Sep 11 05:00–09:00 Sep 12 04:00–07:00, 15:00–18:00 Sep 14 05:00–07:00, 14:00–21:00 Sep 15 02:00–05:00 Sep 16 03:00–10:00 Sep 17 01:00–05:00 Sep 18 01:00–07:00 Sep 19 03:00–08:00 Sep 20 04:00–08:00, 15:00–18:00 Sep 21 03:00–07:00 Sep 22 00:00–07:00 Sep 23 02:00–04:00, 06:00–09:00 Sep 24 02:00–06:00 Sep 25 16:00–19:00 Sep 26 04:00–10:00 Sep 27 02:00–05:00, 14:00–19:00 Sep 29 00:00–08:00 Sep 30 05:00–12:00
October
Oct 1 15:00–20:00 Oct 2 15:00–22:00 Oct 3 14:00–20:00 Oct 4 18:00–24:00 Oct 5 00:00–04:00, 18:00–22:00 Oct 6 13:00–18:00 Oct 7 17:00–20:00 Oct 8 07:00–15:00 Oct 10 01:00–07:00, 18:00–21:00 Oct 12 06:00–10:00, 17:00–23:00 Oct 13 08:00–10:00, 18:00–22:00 Oct 14 19:00–24:00 Oct 15 00:00–01:00, 22:00–24:00 Oct 16 00:00–03:00, 18:00–22:00 Oct 17 11:00–15:00 Oct 18 22:00–24:00 Oct 19 00:00–03:00, 18:00–22:00 Oct 20 23:00–24:00 Oct 21 00:00–02:00, 20:00–24:00 Oct 22 00:00–02:00, 21:00–24:00 Oct 23 00:00–04:00, 06:00–08:00, 22:00–23:00 Oct 27 02:00–09:00 Oct 28 00:00–04:00 Oct 29 01:00–04:00 Oct 30 00:00–03:00 Oct 31 01:00–03:00, 10:00–14:00
November
Nov 1 02:00–06:00 Nov 2 07:00–11:00 Nov 3 05:00–08:00, 13:00–15:00 Nov 4 04:00–08:00 Nov 5 04:00–09:00, 14:00–19:00 Nov 6 06:00–10:00, 15:00–21:00 Nov 7 04:00–07:00 Nov 9 15:00–18:00 Nov 10 08:00–12:00 Nov 11 07:00–10:00 Nov 12 02:00–07:00, 15:00–18:00 Nov 13 05:00–09:00, 15:00–17:00 Nov 17 04:00–05:00 Nov 18 13:00–18:00 Nov 19 05:00–08:00, 13:00–15:00 Nov 20 16:00–18:00 Nov 21 06:00–08:00, 12:00–14:00, 16:00–19:00 Nov 22 16:00–18:00 Nov 23 05:00–09:00, 14:00–21:00 Nov 24 16:00–20:00 Nov 25 13:00–17:00 Nov 27 05:00–10:00 Nov 28 00:00–04:00, 14:00–18:00 Nov 29 05:00–08:00, 15:00–22:00
December
Dec 1 08:00–14:00 Dec 3 08:00–11:00, 20:00–24:00 Dec 4 21:00–24:00 Dec 5 07:00–09:00, 20:00–24:00 Dec 6 14:00–17:00 Dec 7 20:00–24:00 Dec 8 16:00–21:00 Dec 9 07:00–10:00, 15:00–19:00 Dec 10 18:00–22:00 Dec 11 19:00–21:00 Dec 12 15:00–22:00 Dec 13 17:00–23:00 Dec 15 03:00–08:00, 20:00–24:00 Dec 16 20:00–24:00 Dec 17 00:00–04:00, 23:00–24:00 Dec 18 00:00–04:00, 08:00–11:00 Dec 19 00:00–03:00, 22:00–24:00 Dec 20 00:00–04:00, 20:00–23:00 Dec 22 11:00–15:00 Dec 23 02:00–06:00 Dec 25 02:00–07:00 Dec 26 04:00–09:00, 14:00–17:00 Dec 28 04:00–07:00, 12:00–15:00 Dec 31 05:00–08:00, 13:00–15:00