G4 geomagnetic storm days since 1932

Days289

Per year3.0

Latest20 Jan 2026

Days per decade

Latest 50 days

Date	Max Kp	Ap
20 Jan 2026	8-	144
1 Jun 2025	8-	98
16 Apr 2025	8-	75
1 Jan 2025	8o	81
11 Oct 2024	8+	116
12 Aug 2024	8o	127
28 Jun 2024	8-	60
24 Mar 2024	8+	68
24 Apr 2023	8o	72
23 Apr 2023	8+	65
24 Mar 2023	8o	73
4 Nov 2021	8-	72
8 Sep 2017	8+	106
7 Sep 2017	8-	36
23 Jun 2015	8-	72
22 Jun 2015	8+	57
17 Mar 2015	8-	108
2 Oct 2013	8-	58
9 Mar 2012	8o	87
5 Aug 2011	8-	42
5 Apr 2010	8-	55
15 Dec 2006	8+	94
14 Dec 2006	8-	47
11 Sep 2005	8-	101
30 May 2005	8-	90
15 May 2005	8+	87
8 May 2005	8+	91
21 Jan 2005	8o	66
18 Jan 2005	8-	84
7 Jan 2005	8-	40
7 Nov 2004	8o	50
25 Jul 2004	8o	154
31 Oct 2003	8+	116
29 May 2003	8+	109
23 May 2002	8+	78
24 Nov 2001	8+	104
21 Oct 2001	8-	57
11 Apr 2001	8+	85
5 Oct 2000	8-	116
18 Sep 2000	8-	70
17 Sep 2000	8+	56
12 Aug 2000	8-	123
16 Jul 2000	8-	50
24 May 2000	8o	93
6 Apr 2000	8+	82
22 Oct 1999	8o	91
22 Sep 1999	8o	50
30 Jul 1999	8-	53
8 Nov 1998	8-	66
25 Sep 1998	8+	117

Dates and time slots are UTC. Kp is the 3-hourly planetary geomagnetic index (0–9); Ap is the daily average disturbance. G1–G5 follow the NOAA storm scale (Kp 5- and above counted as G1). Aurora visibility also depends on weather and location. The latest values are preliminary.

About this page

289 days since 1932 peaked at G4; the latest was 20 Jan 2026.