Average annual temperature is 16.6 °C
Absolute maximum temperature: 40.0 °C
Absolute minimum temperature: -4.9 °C
Number of sunny days: 165 days
Number of rainy days: 197 days
Number of snow days: 3 days
Look at detailed online map of Iruma-gun
* Weather data for Iruma-gun 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) | 13.9 | 18.6 | 24.0 | 28.4 | 32.8 | 32.3 | 40.0 | 39.0 | 34.6 | 27.3 | 26.7 | 19.7 |
| Average daytime temperature (°C) | 9.2 | 11.5 | 17.8 | 21.7 | 23.8 | 26.8 | 34.1 | 34.1 | 30.6 | 22.9 | 18.0 | 12.8 |
| Average temperature (°C) | 4.2 | 5.9 | 12.0 | 15.5 | 18.2 | 22.5 | 28.4 | 28.7 | 25.9 | 17.7 | 12.5 | 7.3 |
| Average night temperature (°C) | 0.3 | 1.9 | 7.3 | 10.6 | 13.6 | 18.8 | 23.8 | 24.7 | 22.5 | 13.4 | 8.1 | 2.7 |
| Absolute minimum temperature (°C) | -4.9 | -2.5 | 0.2 | 4.2 | 7.1 | 11.2 | 20.8 | 23.1 | 16.0 | 9.0 | 2.6 | -3.6 |
| 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 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.4 | 8.1 | 7.9 | 8.8 | 8.9 | 7.5 | 10.1 | 11.0 | 8.7 | 8.4 | 7.5 | 7.8 |
| Precipitation (mm) | 23 | 42 | 123 | 74 | 191 | 349 | 50 | 131 | 206 | 94 | 60 | 30 |
| Sunny days | 21 | 18 | 16 | 14 | 14 | 6 | 11 | 7 | 6 | 15 | 17 | 20 |
| Rainy days | 8 | 9 | 15 | 16 | 17 | 24 | 20 | 24 | 24 | 16 | 13 | 11 |
| Snow days | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Iruma-gun during the most sunny months:
The largest precipitation sum in Iruma-gun is at