Average annual temperature is 11.2 °C
Absolute maximum temperature: 33.1 °C
Absolute minimum temperature: -12.1 °C
Number of sunny days: 85 days
Number of rainy days: 225 days
Number of snow days: 55 days
Look at detailed online map of Ōiso
* Weather data for Ōiso 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) | 10.3 | 8.9 | 17.8 | 17.3 | 19.0 | 24.1 | 27.5 | 33.1 | 29.2 | 22.1 | 19.3 | 13.3 |
| Average daytime temperature (°C) | -0.1 | 1.3 | 8.5 | 11.1 | 15.5 | 20.8 | 24.4 | 28.6 | 24.5 | 16.8 | 10.5 | 2.8 |
| Average temperature (°C) | -2.3 | -0.8 | 5.4 | 8.5 | 12.5 | 18.0 | 22.1 | 25.9 | 21.6 | 14.0 | 7.6 | 0.6 |
| Average night temperature (°C) | -4.3 | -2.8 | 2.9 | 6.2 | 10.1 | 15.8 | 20.2 | 23.7 | 19.2 | 11.7 | 5.0 | -1.6 |
| Absolute minimum temperature (°C) | -12.1 | -8.4 | -1.9 | 1.6 | 4.5 | 11.9 | 16.4 | 21.0 | 12.6 | 4.6 | -3.4 | -6.5 |
| 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) | 6.4 | 6.9 | 8.8 | 9.2 | 9.6 | 9.3 | 10.1 | 10.5 | 7.7 | 8.2 | 5.8 | 5.1 |
| Precipitation (mm) | 85 | 64 | 73 | 175 | 116 | 131 | 246 | 121 | 178 | 91 | 198 | 102 |
| Sunny days | 1 | 1 | 14 | 6 | 12 | 12 | 4 | 7 | 10 | 9 | 5 | 4 |
| Rainy days | 9 | 11 | 17 | 24 | 19 | 18 | 27 | 24 | 20 | 22 | 21 | 13 |
| Snow days | 21 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 14 |
The best time to visit Ōiso during the most sunny months:
The largest precipitation sum in Ōiso is at