Average annual temperature is 15.3 °C
Absolute maximum temperature: 34.3 °C
Absolute minimum temperature: -7.0 °C
Number of sunny days: 122 days
Number of rainy days: 237 days
Number of snow days: 6 days
Look at detailed online map of Ōsono
* Weather data for Ōsono 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) | 16.1 | 14.7 | 22.3 | 24.5 | 27.3 | 30.3 | 32.5 | 34.3 | 31.3 | 24.3 | 24.5 | 19.2 |
| Average daytime temperature (°C) | 7.6 | 8.8 | 15.3 | 18.1 | 21.7 | 25.1 | 30.0 | 30.6 | 28.8 | 20.8 | 16.1 | 11.1 |
| Average temperature (°C) | 3.9 | 4.9 | 10.6 | 13.5 | 17.4 | 21.4 | 25.6 | 26.5 | 24.3 | 16.2 | 11.9 | 7.4 |
| Average night temperature (°C) | 0.5 | 1.5 | 6.5 | 9.6 | 13.8 | 18.5 | 22.4 | 23.6 | 21.2 | 12.7 | 8.4 | 4.3 |
| Absolute minimum temperature (°C) | -7.0 | -2.8 | -0.3 | 4.5 | 7.6 | 13.9 | 19.0 | 21.0 | 17.2 | 8.7 | 2.2 | -1.3 |
| 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 | 10.0 |
| Daylight mean duration (h) | 10.2 | 11.0 | 12.0 | 13.0 | 13.9 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 6.9 | 7.1 | 8.5 | 8.2 | 9.1 | 6.8 | 10.1 | 9.6 | 9.8 | 8.6 | 7.4 | 6.9 |
| Precipitation (mm) | 115 | 50 | 121 | 280 | 284 | 566 | 96 | 215 | 118 | 90 | 137 | 67 |
| Sunny days | 10 | 12 | 15 | 11 | 12 | 9 | 6 | 1 | 8 | 15 | 13 | 10 |
| Rainy days | 18 | 15 | 16 | 19 | 19 | 21 | 25 | 30 | 22 | 16 | 17 | 19 |
| Snow days | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The largest precipitation sum in Ōsono is at