Average annual temperature is 13.1 °C
Absolute maximum temperature: 32.3 °C
Absolute minimum temperature: -11.3 °C
Number of sunny days: 129 days
Number of rainy days: 226 days
Number of snow days: 10 days
Look at detailed online map of Iwakura
* Weather data for Iwakura 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) | 13.1 | 13.6 | 19.7 | 23.6 | 26.4 | 28.1 | 32.0 | 32.3 | 30.6 | 24.1 | 21.3 | 16.8 |
| Average daytime temperature (°C) | 5.3 | 6.2 | 13.4 | 16.2 | 20.3 | 23.5 | 28.8 | 29.5 | 27.3 | 18.6 | 13.8 | 8.7 |
| Average temperature (°C) | 0.8 | 2.1 | 8.1 | 11.1 | 15.3 | 19.4 | 24.2 | 25.1 | 22.8 | 14.1 | 9.5 | 4.4 |
| Average night temperature (°C) | -2.8 | -1.2 | 3.7 | 7.0 | 11.4 | 15.8 | 20.5 | 22.0 | 19.6 | 10.8 | 6.2 | 1.0 |
| Absolute minimum temperature (°C) | -11.3 | -5.6 | -2.2 | 0.4 | 3.6 | 10.1 | 16.1 | 20.7 | 16.2 | 5.8 | 0.1 | -5.7 |
| 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) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 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) | 6.6 | 5.5 | 8.4 | 7.9 | 9.2 | 6.5 | 9.6 | 9.9 | 9.8 | 8.8 | 7.1 | 6.8 |
| Precipitation (mm) | 63 | 56 | 112 | 191 | 218 | 336 | 162 | 220 | 122 | 51 | 108 | 56 |
| Sunny days | 11 | 10 | 18 | 14 | 15 | 6 | 7 | 1 | 8 | 11 | 13 | 15 |
| Rainy days | 15 | 14 | 13 | 16 | 16 | 24 | 24 | 30 | 22 | 20 | 17 | 15 |
| Snow days | 5 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The largest precipitation sum in Iwakura is at