Average annual temperature is 9.4 °C
Absolute maximum temperature: 33.4 °C
Absolute minimum temperature: -17.9 °C
Number of sunny days: 111 days
Number of rainy days: 203 days
Number of snow days: 51 days
Look at detailed online map of Iidachō
* Weather data for Iidachō 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) | 6.8 | 7.7 | 17.5 | 17.3 | 23.0 | 25.2 | 30.7 | 33.4 | 27.2 | 21.8 | 19.8 | 11.9 |
| Average daytime temperature (°C) | -2.1 | -0.1 | 8.2 | 12.0 | 17.1 | 21.4 | 25.8 | 28.9 | 23.8 | 16.4 | 9.4 | 1.4 |
| Average temperature (°C) | -6.2 | -3.9 | 3.2 | 7.6 | 12.2 | 17.7 | 22.0 | 25.1 | 20.0 | 11.6 | 5.3 | -2.3 |
| Average night temperature (°C) | -10.0 | -8.0 | -1.0 | 3.6 | 7.8 | 14.5 | 18.8 | 22.3 | 16.7 | 7.7 | 1.6 | -6.1 |
| Absolute minimum temperature (°C) | -17.9 | -14.3 | -9.2 | -1.9 | 2.0 | 8.8 | 13.7 | 19.2 | 10.2 | 1.3 | -7.8 | -13.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 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 | 13.4 | 14.6 | 15.2 | 14.9 | 13.8 | 12.5 | 11.1 | 9.8 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.8 | 7.3 | 8.6 | 8.9 | 9.4 | 8.5 | 9.0 | 8.4 | 7.0 | 8.2 | 5.9 | 5.0 |
| Precipitation (mm) | 54 | 38 | 65 | 116 | 58 | 115 | 105 | 102 | 153 | 80 | 148 | 63 |
| Sunny days | 10 | 8 | 14 | 12 | 10 | 10 | 6 | 4 | 8 | 11 | 9 | 9 |
| Rainy days | 3 | 7 | 12 | 18 | 21 | 20 | 25 | 27 | 22 | 20 | 18 | 10 |
| Snow days | 18 | 13 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 12 |
The largest precipitation sum in Iidachō is at