Average annual temperature is 11.9 °C
Absolute maximum temperature: 29.2 °C
Absolute minimum temperature: -12.0 °C
Number of sunny days: 146 days
Number of rainy days: 217 days
Number of snow days: 2 days
Look at detailed online map of Kōyu-gun
* Weather data for Kōyu-gun 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) | 16.3 | 13.7 | 18.2 | 20.6 | 25.4 | 26.3 | 27.8 | 29.2 | 28.0 | 22.6 | 20.8 | 16.1 |
| Average daytime temperature (°C) | 5.6 | 8.2 | 12.8 | 15.1 | 18.9 | 21.6 | 25.2 | 24.5 | 24.7 | 17.9 | 13.2 | 7.8 |
| Average temperature (°C) | 1.0 | 3.3 | 7.9 | 10.4 | 14.5 | 17.7 | 21.4 | 21.2 | 20.2 | 12.9 | 8.7 | 3.3 |
| Average night temperature (°C) | -2.4 | -0.4 | 3.8 | 6.7 | 11.0 | 14.9 | 18.8 | 19.0 | 17.4 | 9.1 | 5.0 | 0.0 |
| Absolute minimum temperature (°C) | -12.0 | -7.2 | -3.9 | -0.2 | 4.5 | 11.3 | 17.5 | 16.9 | 14.5 | 4.9 | -1.9 | -9.6 |
| 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) | 10.3 | 11.0 | 12.0 | 13.0 | 13.8 | 14.2 | 14.0 | 13.3 | 12.4 | 11.4 | 10.5 | 10.1 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 7.6 | 6.5 | 7.7 | 7.6 | 8.5 | 6.4 | 9.6 | 8.4 | 9.8 | 8.6 | 8.5 | 7.0 |
| Precipitation (mm) | 67 | 179 | 175 | 206 | 216 | 515 | 176 | 705 | 85 | 77 | 42 | 117 |
| Sunny days | 21 | 15 | 15 | 13 | 13 | 7 | 0 | 1 | 1 | 20 | 21 | 19 |
| Rainy days | 9 | 12 | 16 | 17 | 18 | 23 | 31 | 30 | 29 | 11 | 9 | 12 |
| Snow days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Kōyu-gun is at