Average annual temperature is 11.6 °C
Absolute maximum temperature: 31.3 °C
Absolute minimum temperature: -10.7 °C
Number of sunny days: 145 days
Number of rainy days: 203 days
Number of snow days: 17 days
Look at detailed online map of Irisawa
* Weather data for Irisawa 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) | 12.9 | 14.2 | 17.7 | 23.4 | 26.8 | 28.0 | 31.3 | 30.7 | 30.0 | 22.4 | 21.2 | 20.0 |
| Average daytime temperature (°C) | 5.5 | 6.8 | 12.6 | 16.9 | 19.0 | 22.6 | 28.1 | 28.1 | 25.6 | 17.5 | 13.5 | 9.2 |
| Average temperature (°C) | -0.2 | 0.9 | 6.6 | 10.3 | 13.7 | 18.3 | 23.1 | 23.5 | 21.1 | 11.5 | 7.5 | 2.6 |
| Average night temperature (°C) | -3.9 | -3.4 | 1.2 | 4.6 | 8.6 | 14.5 | 18.2 | 19.6 | 17.5 | 6.4 | 2.6 | -2.2 |
| Absolute minimum temperature (°C) | -10.7 | -7.0 | -4.9 | -3.8 | 2.6 | 8.0 | 13.3 | 15.9 | 9.3 | 1.7 | -3.5 | -6.2 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.7 | 7.8 | 8.6 | 9.4 | 9.3 | 8.1 | 10.0 | 10.5 | 9.1 | 9.0 | 8.1 | 7.7 |
| Precipitation (mm) | 26 | 49 | 91 | 100 | 187 | 300 | 92 | 174 | 186 | 83 | 54 | 29 |
| Sunny days | 17 | 14 | 13 | 16 | 13 | 6 | 5 | 2 | 3 | 17 | 20 | 19 |
| Rainy days | 4 | 9 | 18 | 14 | 18 | 24 | 26 | 29 | 27 | 14 | 10 | 10 |
| Snow days | 10 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The largest precipitation sum in Irisawa is at