Average annual temperature is 8.7 °C
Absolute maximum temperature: 31.1 °C
Absolute minimum temperature: -13.8 °C
Number of sunny days: 84 days
Number of rainy days: 206 days
Number of snow days: 75 days
Look at detailed online map of Iwanai-gun
* Weather data for Iwanai-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) | 5.6 | 6.7 | 14.3 | 17.9 | 22.1 | 26.9 | 28.3 | 31.1 | 26.6 | 20.6 | 17.5 | 9.2 |
| Average daytime temperature (°C) | -3.9 | -2.1 | 5.5 | 10.2 | 16.0 | 21.3 | 24.4 | 27.6 | 22.7 | 15.1 | 7.4 | -0.8 |
| Average temperature (°C) | -5.9 | -4.1 | 1.6 | 6.2 | 11.2 | 17.2 | 21.0 | 24.2 | 19.2 | 11.2 | 4.5 | -2.8 |
| Average night temperature (°C) | -7.8 | -6.2 | -1.6 | 3.0 | 7.0 | 13.8 | 18.2 | 21.6 | 16.3 | 7.9 | 1.8 | -5.1 |
| Absolute minimum temperature (°C) | -13.8 | -10.5 | -5.8 | -2.9 | 1.4 | 7.5 | 13.0 | 19.1 | 9.8 | 3.0 | -6.3 | -10.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.4 | 10.5 | 11.9 | 13.4 | 14.7 | 15.3 | 15.0 | 13.9 | 12.5 | 11.0 | 9.8 | 9.1 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.3 | 5.8 | 8.0 | 8.1 | 10.7 | 10.0 | 9.6 | 9.5 | 7.8 | 7.6 | 5.0 | 3.4 |
| Precipitation (mm) | 134 | 125 | 69 | 108 | 90 | 156 | 152 | 198 | 151 | 230 | 214 | 196 |
| Sunny days | 2 | 1 | 14 | 6 | 13 | 11 | 11 | 5 | 7 | 10 | 3 | 1 |
| Rainy days | 3 | 4 | 13 | 24 | 18 | 19 | 20 | 26 | 23 | 21 | 22 | 13 |
| Snow days | 26 | 23 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 17 |
The best time to visit Iwanai-gun during the most sunny months:
Months with the longest average daylight duration in Iwanai-gun:
The largest precipitation sum in Iwanai-gun is at