Average annual temperature is 9.0 °C
Absolute maximum temperature: 31.0 °C
Absolute minimum temperature: -16.2 °C
Number of sunny days: 134 days
Number of rainy days: 195 days
Number of snow days: 36 days
Look at detailed online map of Koyama
* Weather data for Koyama 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) | 9.9 | 10.6 | 17.5 | 20.7 | 25.6 | 24.1 | 28.2 | 31.0 | 30.9 | 20.1 | 20.2 | 14.8 |
| Average daytime temperature (°C) | 0.3 | 1.2 | 9.1 | 12.9 | 16.5 | 20.2 | 25.4 | 28.5 | 25.1 | 14.7 | 10.7 | 5.4 |
| Average temperature (°C) | -4.4 | -3.0 | 3.4 | 7.0 | 10.9 | 15.7 | 20.6 | 22.8 | 19.2 | 9.2 | 5.3 | 0.3 |
| Average night temperature (°C) | -8.0 | -6.3 | -1.0 | 2.3 | 6.3 | 11.9 | 16.3 | 18.3 | 15.3 | 5.3 | 1.6 | -3.2 |
| Absolute minimum temperature (°C) | -16.2 | -12.8 | -12.0 | -3.6 | -0.6 | 4.6 | 12.9 | 15.6 | 7.6 | 1.3 | -5.9 | -8.4 |
| 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 | 10.8 | 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) | 6.9 | 7.2 | 8.7 | 9.0 | 9.3 | 8.5 | 10.5 | 11.2 | 9.2 | 9.0 | 7.6 | 7.3 |
| Precipitation (mm) | 104 | 75 | 104 | 98 | 149 | 176 | 104 | 44 | 101 | 51 | 98 | 90 |
| Sunny days | 7 | 10 | 16 | 16 | 14 | 11 | 7 | 4 | 7 | 15 | 14 | 13 |
| Rainy days | 6 | 9 | 15 | 14 | 17 | 19 | 24 | 27 | 23 | 16 | 16 | 9 |
| Snow days | 18 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 |
The best time to visit Koyama during the most sunny months:
The largest precipitation sum in Koyama is at