Average annual temperature is 11.7 °C
Absolute maximum temperature: 33.9 °C
Absolute minimum temperature: -13.5 °C
Number of sunny days: 135 days
Number of rainy days: 209 days
Number of snow days: 21 days
Look at detailed online map of Gunma-ken
* Weather data for Gunma-ken Japan is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 11.5 | 13.1 | 17.6 | 22.4 | 28.7 | 27.9 | 33.9 | 32.1 | 30.4 | 22.6 | 22.0 | 15.6 |
| Average daytime temperature (°C) | 4.4 | 5.4 | 12.3 | 16.2 | 19.4 | 22.9 | 28.5 | 28.4 | 25.8 | 17.8 | 12.9 | 8.1 |
| Average temperature (°C) | -0.8 | 0.4 | 6.7 | 9.9 | 13.9 | 18.6 | 23.4 | 24.0 | 21.6 | 12.5 | 7.4 | 2.4 |
| Average night temperature (°C) | -4.3 | -2.8 | 2.0 | 4.7 | 9.0 | 14.9 | 19.2 | 20.8 | 18.4 | 8.3 | 3.3 | -1.2 |
| Absolute minimum temperature (°C) | -13.5 | -6.9 | -4.7 | -2.6 | 1.0 | 8.2 | 16.4 | 17.6 | 11.7 | 4.1 | -2.8 | -7.2 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.5 | 7.7 | 8.4 | 9.0 | 8.7 | 7.7 | 9.9 | 10.2 | 8.6 | 8.8 | 7.8 | 7.7 |
| Precipitation (mm) | 23 | 44 | 101 | 83 | 202 | 324 | 153 | 178 | 225 | 87 | 56 | 50 |
| Sunny days | 17 | 13 | 14 | 15 | 14 | 7 | 4 | 1 | 3 | 13 | 16 | 18 |
| Rainy days | 4 | 8 | 17 | 15 | 17 | 23 | 27 | 30 | 27 | 18 | 14 | 9 |
| Snow days | 10 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
The largest precipitation sum in Gunma-ken is at