Average annual temperature is 10.8 °C
Absolute maximum temperature: 31.3 °C
Absolute minimum temperature: -13.0 °C
Number of sunny days: 95 days
Number of rainy days: 217 days
Number of snow days: 53 days
Look at detailed online map of Izumisawa
* Weather data for Izumisawa 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) | 9.5 | 8.8 | 13.4 | 16.5 | 22.8 | 25.7 | 30.9 | 31.3 | 28.1 | 23.4 | 21.2 | 13.4 |
| Average daytime temperature (°C) | -0.4 | 1.2 | 9.2 | 12.5 | 16.7 | 20.6 | 25.4 | 28.3 | 24.5 | 17.5 | 10.8 | 2.9 |
| Average temperature (°C) | -3.3 | -1.6 | 4.9 | 8.7 | 12.6 | 17.4 | 22.2 | 25.4 | 21.5 | 13.5 | 7.4 | 0.0 |
| Average night temperature (°C) | -5.9 | -5.1 | 1.5 | 5.7 | 9.2 | 14.9 | 19.7 | 23.0 | 18.8 | 10.2 | 4.3 | -3.0 |
| Absolute minimum temperature (°C) | -13.0 | -10.6 | -4.2 | 0.6 | 3.9 | 10.8 | 15.6 | 20.6 | 12.3 | 4.8 | -3.5 | -9.8 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.6 | 11.9 | 13.3 | 14.5 | 15.2 | 14.9 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.6 | 7.1 | 8.5 | 9.1 | 9.3 | 8.3 | 9.2 | 9.2 | 7.5 | 8.2 | 6.0 | 4.5 |
| Precipitation (mm) | 67 | 38 | 55 | 134 | 67 | 127 | 117 | 124 | 165 | 97 | 138 | 71 |
| Sunny days | 5 | 5 | 14 | 12 | 10 | 9 | 5 | 3 | 9 | 12 | 6 | 5 |
| Rainy days | 8 | 8 | 16 | 18 | 21 | 21 | 26 | 28 | 21 | 19 | 21 | 10 |
| Snow days | 18 | 15 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 16 |
The largest precipitation sum in Izumisawa is at