Average annual temperature is 11.2 °C
Absolute maximum temperature: 34.5 °C
Absolute minimum temperature: -12.0 °C
Number of sunny days: 75 days
Number of rainy days: 231 days
Number of snow days: 59 days
Look at detailed online map of Ō Iwa
* Weather data for Ō Iwa 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) | 9.0 | 7.5 | 19.9 | 18.6 | 20.4 | 26.7 | 29.8 | 34.5 | 29.9 | 22.1 | 19.6 | 13.1 |
| Average daytime temperature (°C) | -0.4 | 1.0 | 8.4 | 11.5 | 16.5 | 21.9 | 25.5 | 29.7 | 24.9 | 17.0 | 10.5 | 2.6 |
| Average temperature (°C) | -2.5 | -1.0 | 5.1 | 8.5 | 12.9 | 18.8 | 22.6 | 26.3 | 21.5 | 13.8 | 7.3 | 0.3 |
| Average night temperature (°C) | -4.4 | -2.9 | 2.4 | 6.1 | 9.9 | 16.2 | 20.2 | 23.8 | 18.7 | 11.3 | 4.5 | -2.0 |
| Absolute minimum temperature (°C) | -12.0 | -8.5 | -2.4 | 1.0 | 3.3 | 11.7 | 16.5 | 21.1 | 11.2 | 4.5 | -4.0 | -7.1 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.3 | 6.7 | 8.7 | 8.9 | 9.6 | 9.4 | 9.9 | 10.4 | 7.7 | 8.1 | 5.7 | 4.9 |
| Precipitation (mm) | 107 | 77 | 78 | 186 | 114 | 158 | 268 | 115 | 167 | 114 | 220 | 109 |
| Sunny days | 1 | 1 | 14 | 5 | 12 | 11 | 4 | 6 | 9 | 7 | 3 | 2 |
| Rainy days | 6 | 14 | 16 | 25 | 19 | 19 | 27 | 25 | 21 | 24 | 21 | 14 |
| Snow days | 24 | 13 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 15 |
The best time to visit Ō Iwa during the most sunny months:
The largest precipitation sum in Ō Iwa is at