Average annual temperature is 15.2 °C
Absolute maximum temperature: 36.6 °C
Absolute minimum temperature: -7.1 °C
Number of sunny days: 142 days
Number of rainy days: 217 days
Number of snow days: 6 days
Look at detailed online map of Koteyama
* Weather data for Koteyama 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) | 13.3 | 16.0 | 22.3 | 27.6 | 32.0 | 30.6 | 36.6 | 36.4 | 34.9 | 26.4 | 24.8 | 19.1 |
| Average daytime temperature (°C) | 8.0 | 9.8 | 16.6 | 20.3 | 23.1 | 26.3 | 31.6 | 33.0 | 29.2 | 21.4 | 16.9 | 12.0 |
| Average temperature (°C) | 2.5 | 4.1 | 10.5 | 14.0 | 17.1 | 21.6 | 26.4 | 27.7 | 24.8 | 16.2 | 11.2 | 6.1 |
| Average night temperature (°C) | -1.9 | -0.6 | 5.5 | 8.8 | 12.1 | 17.7 | 22.1 | 23.9 | 21.6 | 11.9 | 6.8 | 1.7 |
| Absolute minimum temperature (°C) | -7.1 | -5.5 | -0.4 | 1.8 | 5.6 | 11.4 | 18.8 | 23.0 | 15.5 | 7.7 | 0.9 | -5.3 |
| 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 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| 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) | 7.5 | 8.1 | 8.0 | 9.0 | 9.2 | 7.7 | 10.0 | 10.7 | 8.2 | 8.3 | 7.5 | 7.6 |
| Precipitation (mm) | 21 | 34 | 105 | 97 | 194 | 338 | 108 | 211 | 249 | 122 | 72 | 31 |
| Sunny days | 16 | 15 | 17 | 15 | 12 | 6 | 7 | 1 | 3 | 14 | 16 | 20 |
| Rainy days | 12 | 10 | 14 | 15 | 19 | 24 | 24 | 30 | 27 | 17 | 14 | 11 |
| Snow days | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Koteyama during the most sunny months:
The largest precipitation sum in Koteyama is at