| 日期 | 天气 | 高/低 | 降水 |
|---|---|---|---|
| 2025-12-01 | 阴 | -20°/-25° | 0.0 mm |
| 2025-12-02 | 阴 | -13°/-27° | 0.0 mm |
| 2025-12-03 | 小雪 | -3°/-14° | 1.1 mm |
| 2025-12-04 | 阴 | -2°/-15° | 0.0 mm |
| 2025-12-05 | 阴 | -4°/-13° | 0.0 mm |
| 2025-12-06 | 小雪 | -4°/-14° | 0.2 mm |
| 2025-12-07 | 阴 | -11°/-19° | 0.0 mm |
| 2025-12-08 | 中雪 | -10°/-19° | 1.2 mm |
| 2025-12-09 | 阴 | -18°/-25° | 0.0 mm |
| 2025-12-10 | 多云 | -18°/-27° | 0.0 mm |
| 2025-12-11 | 阴 | -16°/-26° | 0.0 mm |
| 2025-12-12 | 阴 | -10°/-24° | 0.0 mm |
| 2025-12-13 | 阴 | -7°/-19° | 0.0 mm |
| 2025-12-14 | 阴 | -7°/-17° | 0.0 mm |
| 2025-12-15 | 小雪 | -5°/-13° | 0.1 mm |
| 2025-12-16 | 阴 | -5°/-15° | 0.0 mm |
| 2025-12-17 | 小雪 | -6°/-12° | 0.9 mm |
| 2025-12-18 | 中雪 | -6°/-14° | 8.1 mm |
| 2025-12-19 | 阴 | -14°/-25° | 0.0 mm |
| 2025-12-20 | 阴 | -10°/-28° | 0.0 mm |
| 2025-12-21 | 阴 | -7°/-17° | 0.0 mm |
| 2025-12-22 | 小雪 | -8°/-20° | 0.6 mm |
| 2025-12-23 | 小雪 | -13°/-23° | 0.4 mm |
| 2025-12-24 | 阴 | -15°/-28° | 0.0 mm |
| 2025-12-25 | 阴 | -7°/-23° | 0.0 mm |
| 2025-12-26 | 阴 | -4°/-18° | 0.0 mm |
| 2025-12-27 | 中雪 | -5°/-20° | 1.7 mm |
| 2025-12-28 | 阴 | -15°/-25° | 0.0 mm |
| 2025-12-29 | 小毛毛雨 | -13°/-20° | 0.2 mm |
| 2025-12-30 | 阴 | -12°/-28° | 0.0 mm |
| 2025-12-31 | 阴 | -6°/-21° | 0.0 mm |
2025年12月伊尔库茨克共记录 31 天，平均最高 -9℃、最低 -20℃，降水日 10 天。