Average annual temperature is 11.5 °C
Absolute maximum temperature: 31.9 °C
Absolute minimum temperature: -15.9 °C
Number of sunny days: 135 days
Number of rainy days: 218 days
Number of snow days: 12 days
Look at detailed online map of Koasumi
* Weather data for Koasumi 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) | 11.8 | 12.1 | 18.6 | 22.8 | 26.6 | 26.9 | 31.9 | 29.8 | 29.4 | 23.5 | 23.0 | 17.1 |
| Average daytime temperature (°C) | 4.6 | 5.8 | 12.1 | 15.8 | 18.3 | 21.9 | 27.7 | 27.4 | 25.2 | 17.2 | 14.1 | 8.9 |
| Average temperature (°C) | -0.8 | 0.4 | 6.7 | 10.3 | 13.4 | 17.7 | 22.6 | 22.7 | 20.5 | 12.2 | 8.3 | 3.3 |
| Average night temperature (°C) | -4.8 | -4.1 | 2.5 | 5.9 | 9.4 | 14.4 | 18.4 | 19.1 | 16.9 | 8.5 | 4.3 | -0.9 |
| Absolute minimum temperature (°C) | -15.9 | -12.4 | -3.5 | 0.5 | 4.9 | 11.9 | 14.8 | 16.3 | 10.2 | 4.6 | -2.6 | -10.3 |
| 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 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.2 | 7.5 | 8.2 | 9.0 | 8.9 | 7.6 | 10.2 | 10.8 | 9.3 | 8.8 | 7.6 | 7.7 |
| Precipitation (mm) | 48 | 93 | 201 | 155 | 243 | 441 | 82 | 154 | 211 | 127 | 107 | 80 |
| Sunny days | 15 | 13 | 12 | 11 | 12 | 4 | 7 | 4 | 4 | 13 | 20 | 20 |
| Rainy days | 9 | 11 | 19 | 19 | 19 | 26 | 24 | 27 | 26 | 18 | 10 | 10 |
| Snow days | 7 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Koasumi during the most sunny months:
The largest precipitation sum in Koasumi is at