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Solar flares in December 2025
C-class260
M-class32
X-class2
LargestX1.92025-12-01
Sunspot number118.3NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| December 2024 | 295 | 88 | 3 | X2.2 |
| December 2025 | 260 | 32 | 2 | X1.9 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2025-12-01 | 02:27 | 02:49 | 38 | X1.9 | – | – |
| 2025-12-08 | 04:49 | 05:01 | 15 | X1.1 | – | – |
| 2025-12-06 | 20:29 | 20:39 | 20 | M8.1 | – | – |
| 2025-12-31 | 13:11 | 13:51 | 60 | M7.1 | – | – |
| 2025-12-04 | 02:36 | 02:50 | 23 | M6.0 | – | – |
| 2025-12-27 | 01:38 | 01:50 | 21 | M5.1 | – | – |
| 2025-12-10 | 21:58 | 22:08 | 16 | M4.4 | – | – |
| 2025-12-28 | 22:01 | 22:39 | 53 | M4.2 | – | – |
| 2025-12-08 | 21:13 | 21:17 | 12 | M3.1 | – | – |
| 2025-12-07 | 23:56 | 00:12 | 27 | M2.4 | – | – |
| 2025-12-28 | 23:57 | 00:02 | 10 | M2.2 | – | – |
| 2025-12-08 | 00:33 | 00:36 | 6 | M2.0 | – | – |
| 2025-12-09 | 00:37 | 00:58 | 40 | M2.0 | – | – |
| 2025-12-12 | 04:50 | 05:05 | 24 | M2.0 | – | – |
| 2025-12-10 | 07:31 | 07:37 | 11 | M1.9 | – | – |
All times UTC. Until June 2017 classes are NOAA's reports of the time (GOES-15 and earlier included a 0.7 scaling factor); later classes come from calibrated GOES-16/18 data, so the same flare reads about 1.4× larger. Do not compare the two periods directly.
About this page
294 flares of class C or larger in December 2025; by M/X count it ranks 96 of 565 months.