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Geomagnetic activity in December 2025
Mean Ap13.4No. 477 of 1138
G1+ days9
G3+ days1
Max Ap324 Dec 2025
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 3 Dec 2025 | 7- | 31 | G3 |
| 4 Dec 2025 | 5o | 32 | G1 |
| 10 Dec 2025 | 6o | 19 | G2 |
| 11 Dec 2025 | 6o | 27 | G2 |
| 12 Dec 2025 | 5o | 27 | G1 |
| 13 Dec 2025 | 5- | 14 | G1 |
| 17 Dec 2025 | 5- | 17 | G1 |
| 21 Dec 2025 | 5- | 25 | G1 |
| 22 Dec 2025 | 5- | 23 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 2024 | 8.3 | 1 | 0 |
| December 2025 | 13.4 | 9 | 1 |
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
Mean Ap 13.4 in December 2025, No. 477 of 1138 months since 1932; 9 days reached G1 or higher.