Average annual temperature is 11.6 °C
Absolute maximum temperature: 34.7 °C
Absolute minimum temperature: -11.4 °C
Number of sunny days: 86 days
Number of rainy days: 216 days
Number of snow days: 63 days
Look at detailed online map of Kosai
* Weather data for Kosai 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) | 9.5 | 7.9 | 16.7 | 17.4 | 21.3 | 25.6 | 28.6 | 34.7 | 29.2 | 22.4 | 21.1 | 13.4 |
| Average daytime temperature (°C) | 0.1 | 1.1 | 8.5 | 11.9 | 16.0 | 21.4 | 25.1 | 29.6 | 24.9 | 17.3 | 11.2 | 3.6 |
| Average temperature (°C) | -1.8 | -0.6 | 5.5 | 9.0 | 12.7 | 18.4 | 22.7 | 26.3 | 22.2 | 14.6 | 8.3 | 1.5 |
| Average night temperature (°C) | -3.4 | -2.4 | 3.1 | 6.7 | 10.1 | 16.1 | 20.6 | 24.0 | 20.1 | 12.6 | 5.8 | -0.7 |
| Absolute minimum temperature (°C) | -11.4 | -6.8 | -1.1 | 2.0 | 4.3 | 12.0 | 16.4 | 20.7 | 14.4 | 6.1 | -2.5 | -5.1 |
| 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) | 6.6 | 6.8 | 9.1 | 9.5 | 9.7 | 9.0 | 10.4 | 10.4 | 7.7 | 8.3 | 6.0 | 5.4 |
| Precipitation (mm) | 99 | 86 | 69 | 136 | 88 | 111 | 150 | 64 | 130 | 124 | 154 | 99 |
| Sunny days | 1 | 3 | 14 | 7 | 13 | 9 | 6 | 7 | 9 | 8 | 6 | 3 |
| Rainy days | 6 | 8 | 13 | 23 | 18 | 21 | 25 | 24 | 21 | 23 | 21 | 13 |
| Snow days | 24 | 17 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 15 |
The best time to visit Kosai during the most sunny months:
The largest precipitation sum in Kosai is at