Solar Flares in December, 2025
29 flares ↑ MAX: X1.9 ↓ MIN: B5.1
29 flares ↑ MAX: X1.9 ↓ MIN: B5.1
In December 2025, 29 solar flares were recorded; the strongest was X1.9 on December 1, 2025. The longest run of consecutive active days was 3 (8 Dec–10 Dec).
Most powerful Solar Flares in December 2025
| Date | Class | Level | Duration |
|---|---|---|---|
| December 1, 2025 | X1.9 | High level | 2 h 16 min |
| December 8, 2025 | X1.1 | High level | 6 min |
| December 6, 2025 | M8.1 | Moderate level | 26 min |
| December 31, 2025 | M7.1 | Moderate level | 1 h 11 min |
| December 4, 2025 | M6.1 | Moderate level | 21 min |
| December 27, 2025 | M5.2 | Moderate level | 36 min |
| December 10, 2025 | M4.5 | Moderate level | 7 min |
| December 28, 2025 | M4.2 | Moderate level | 51 min |
| December 8, 2025 | M3.2 | Moderate level | 8 min |
| December 8, 2025 | M2.5 | Moderate level | 36 min |
| December 29, 2025 | M2.2 | Moderate level | 8 min |
| December 9, 2025 | M2 | Moderate level | 51 min |
| December 10, 2025 | M2 | Moderate level | 3 min |
| December 12, 2025 | M2 | Moderate level | 35 min |
| December 8, 2025 | M1.8 | Moderate level | 11 min |
| December 9, 2025 | M1.7 | Moderate level | 35 min |
| December 9, 2025 | M1.6 | Moderate level | 6 min |
| December 10, 2025 | M1.6 | Moderate level | — |
| December 9, 2025 | M1.5 | Moderate level | 1 min |
| December 10, 2025 | M1.3 | Moderate level | — |
| December 21, 2025 | M1.3 | Moderate level | 6 min |
| December 28, 2025 | M1.3 | Moderate level | 2 min |
| December 6, 2025 | M1.2 | Moderate level | 6 min |
| December 8, 2025 | M1.2 | Moderate level | 7 min |
| December 8, 2025 | M1.1 | Moderate level | 6 min |
| December 19, 2025 | M1.1 | Moderate level | 4 min |
| December 20, 2025 | M1.1 | Moderate level | — |
| December 10, 2025 | M1 | Moderate level | — |
| December 29, 2025 | M1 | Moderate level | — |