Most often in August, 26 days.
Highest follower count seen that year: 1,492.
January
Jan 2 00:00–01:00 Jan 3 00:00–03:00 Jan 4 00:00–03:00 Jan 5 00:00–03:00 Jan 6 02:00–03:00 Jan 7 00:00–02:00 Jan 8 00:00–02:00 Jan 9 00:00–03:00 Jan 11 00:00–02:00 Jan 12 23:00–24:00 Jan 13 00:00–02:00 Jan 14 01:00–03:00, 23:00–24:00 Jan 15 00:00–02:00, 23:00–24:00 Jan 16 00:00–01:00 Jan 17 00:00–02:00 Jan 18 01:00–03:00, 17:00–20:00 Jan 20 00:00–02:00 Jan 21 01:00–02:00 Jan 22 00:00–02:00 Jan 25 01:00–02:00 Jan 26 01:00–04:00 Jan 27 23:00–24:00 Jan 28 00:00–02:00, 23:00–24:00 Jan 29 00:00–02:00 Jan 30 00:00–03:00 Jan 31 00:00–03:00
February
Feb 1 01:00–03:00 Feb 17 19:00–21:00, 23:00–24:00 Feb 18 00:00–02:00 Feb 19 01:00–02:00 Feb 22 00:00–02:00 Feb 23 00:00–04:00 Feb 25 00:00–02:00 Feb 26 00:00–04:00 Feb 27 00:00–02:00 Feb 28 00:00–03:00
March
Mar 1 00:00–03:00 Mar 2 02:00–04:00 Mar 3 15:00–18:00 Mar 9 02:00–04:00 Mar 11 01:00–02:00, 23:00–24:00 Mar 12 00:00–01:00 Mar 14 23:00–24:00 Mar 15 01:00–03:00 Mar 16 01:00–04:00 Mar 21 00:00–01:00 Mar 22 00:00–02:00 Mar 23 02:00–03:00 Mar 24 01:00–02:00 Mar 26 00:00–02:00 Mar 29 02:00–05:00 Mar 30 02:00–04:00
April
Apr 2 00:00–03:00, 19:00–21:00 Apr 3 00:00–03:00 Apr 5 01:00–02:00 Apr 6 02:00–03:00 Apr 9 01:00–02:00 Apr 10 01:00–04:00 Apr 11 23:00–24:00 Apr 12 00:00–01:00 Apr 13 00:00–03:00, 19:00–21:00 Apr 14 00:00–02:00 Apr 15 01:00–02:00 Apr 16 00:00–02:00, 23:00–24:00 Apr 17 00:00–02:00, 23:00–24:00 Apr 18 00:00–01:00 Apr 19 01:00–02:00 Apr 21 00:00–01:00, 19:00–20:00, 23:00–24:00 Apr 23 00:00–02:00 Apr 24 00:00–02:00, 23:00–24:00 Apr 25 00:00–01:00 Apr 27 00:00–03:00 Apr 29 00:00–02:00
May
May 1 00:00–03:00 May 2 00:00–02:00, 19:00–20:00 May 3 00:00–02:00 May 5 19:00–21:00, 23:00–24:00 May 6 00:00–02:00 May 7 00:00–02:00, 19:00–20:00 May 8 00:00–02:00 May 9 00:00–03:00 May 10 00:00–03:00 May 11 01:00–03:00, 17:00–19:00 May 12 01:00–02:00 May 13 00:00–01:00 May 14 00:00–02:00 May 16 00:00–03:00 May 17 00:00–02:00 May 18 00:00–04:00 May 19 00:00–01:00, 21:00–23:00 May 20 01:00–03:00 May 21 00:00–03:00 May 24 00:00–03:00 May 28 00:00–03:00 May 30 00:00–03:00 May 31 01:00–03:00
June
Jun 1 04:00–05:00 Jun 2 20:00–21:00 Jun 3 00:00–02:00 Jun 4 00:00–02:00 Jun 5 00:00–01:00 Jun 6 00:00–02:00 Jun 7 00:00–05:00 Jun 8 01:00–05:00, 18:00–19:00 Jun 9 00:00–02:00, 22:00–24:00 Jun 10 00:00–02:00 Jun 11 00:00–03:00 Jun 12 00:00–02:00 Jun 13 00:00–02:00 Jun 15 01:00–04:00 Jun 16 23:00–24:00 Jun 17 00:00–02:00 Jun 18 00:00–02:00 Jun 20 00:00–04:00, 17:00–19:00 Jun 21 03:00–04:00 Jun 22 02:00–04:00 Jun 24 00:00–01:00 Jun 26 02:00–03:00 Jun 28 00:00–02:00 Jun 29 00:00–03:00, 23:00–24:00 Jun 30 00:00–01:00, 23:00–24:00
July
Jul 1 00:00–02:00 Jul 4 00:00–02:00 Jul 6 23:00–24:00 Jul 9 16:00–17:00 Jul 20 02:00–04:00 Jul 21 00:00–02:00 Jul 26 01:00–03:00 Jul 27 01:00–03:00, 21:00–23:00 Jul 28 00:00–01:00 Jul 30 23:00–24:00 Jul 31 00:00–01:00
August
Aug 2 00:00–03:00 Aug 3 01:00–04:00, 23:00–24:00 Aug 4 00:00–02:00, 23:00–24:00 Aug 7 02:00–03:00 Aug 8 00:00–02:00 Aug 9 00:00–03:00 Aug 10 02:00–04:00 Aug 11 00:00–02:00 Aug 12 01:00–03:00 Aug 13 02:00–04:00 Aug 14 00:00–02:00 Aug 15 00:00–03:00 Aug 16 00:00–04:00 Aug 17 00:00–04:00, 17:00–21:00, 23:00–24:00 Aug 18 00:00–02:00 Aug 19 01:00–02:00 Aug 21 00:00–03:00 Aug 22 01:00–03:00 Aug 23 00:00–02:00 Aug 24 01:00–03:00, 22:00–23:00 Aug 26 01:00–02:00 Aug 27 01:00–02:00 Aug 28 00:00–01:00 Aug 29 01:00–03:00 Aug 30 01:00–03:00 Aug 31 01:00–03:00
September
Sep 1 00:00–02:00 Sep 3 01:00–02:00 Sep 4 00:00–02:00 Sep 5 00:00–03:00 Sep 6 00:00–03:00 Sep 7 01:00–05:00, 23:00–24:00 Sep 9 01:00–03:00 Sep 10 01:00–03:00 Sep 11 01:00–03:00 Sep 12 01:00–02:00 Sep 13 00:00–04:00, 15:00–16:00 Sep 14 02:00–05:00 Sep 15 01:00–02:00 Sep 17 02:00–03:00 Sep 18 01:00–02:00 Sep 19 02:00–03:00 Sep 21 01:00–03:00 Sep 22 01:00–03:00 Sep 23 01:00–03:00, 20:00–21:00 Sep 25 02:00–04:00 Sep 26 01:00–03:00 Sep 28 03:00–04:00, 19:00–20:00 Sep 29 01:00–03:00 Sep 30 00:00–02:00
October
Oct 2 00:00–01:00 Oct 3 01:00–02:00 Oct 5 02:00–05:00 Oct 6 00:00–02:00 Oct 7 00:00–02:00 Oct 9 01:00–02:00 Oct 10 03:00–04:00 Oct 11 01:00–04:00 Oct 12 02:00–04:00 Oct 13 01:00–03:00 Oct 16 01:00–02:00 Oct 17 01:00–02:00 Oct 18 01:00–04:00 Oct 19 01:00–04:00 Oct 20 00:00–02:00 Oct 21 00:00–02:00 Oct 22 00:00–03:00 Oct 24 00:00–03:00, 19:00–20:00 Oct 25 01:00–04:00 Oct 26 02:00–04:00 Oct 27 00:00–01:00 Oct 28 01:00–02:00 Oct 29 02:00–04:00 Oct 30 01:00–03:00, 20:00–22:00 Oct 31 01:00–03:00
November
Nov 1 00:00–01:00 Nov 2 03:00–05:00 Nov 3 01:00–02:00, 19:00–21:00 Nov 4 00:00–02:00 Nov 5 00:00–02:00 Nov 6 01:00–03:00 Nov 7 00:00–03:00 Nov 8 01:00–02:00, 14:00–16:00 Nov 9 01:00–04:00 Nov 10 00:00–03:00 Nov 11 01:00–02:00 Nov 12 00:00–02:00 Nov 16 01:00–04:00 Nov 17 00:00–02:00 Nov 19 21:00–22:00 Nov 21 01:00–02:00 Nov 22 02:00–05:00, 18:00–19:00 Nov 29 02:00–04:00 Nov 30 03:00–05:00
December
Dec 1 01:00–02:00 Dec 2 01:00–02:00 Dec 3 01:00–03:00 Dec 6 02:00–03:00 Dec 8 02:00–03:00 Dec 11 01:00–02:00, 22:00–23:00 Dec 15 01:00–02:00 Dec 19 01:00–02:00 Dec 27 00:00–01:00