Average annual temperature is 10.7 °C
Absolute maximum temperature: 29.8 °C
Absolute minimum temperature: -12.3 °C
Number of sunny days: 134 days
Number of rainy days: 214 days
Number of snow days: 17 days
Look at detailed online map of Karuizawa
* Weather data for Karuizawa 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) | 11.9 | 11.8 | 19.0 | 22.5 | 26.9 | 26.0 | 29.8 | 29.3 | 27.9 | 20.5 | 19.7 | 15.4 |
| Average daytime temperature (°C) | 3.7 | 4.9 | 11.1 | 15.0 | 17.4 | 20.9 | 26.2 | 26.0 | 23.7 | 16.3 | 11.8 | 7.3 |
| Average temperature (°C) | -1.3 | 0.0 | 5.9 | 9.1 | 12.6 | 16.9 | 21.8 | 22.1 | 19.8 | 11.2 | 7.1 | 2.2 |
| Average night temperature (°C) | -4.5 | -3.6 | 1.9 | 4.4 | 8.5 | 13.8 | 18.2 | 19.4 | 17.1 | 7.5 | 3.6 | -1.4 |
| Absolute minimum temperature (°C) | -12.3 | -7.6 | -5.1 | -1.0 | 1.3 | 8.4 | 15.5 | 17.4 | 10.3 | 2.5 | -2.9 | -7.1 |
| 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 | 14.0 | 14.0 | 13.0 | 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 | 10.3 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.6 | 7.8 | 8.6 | 9.3 | 9.2 | 8.1 | 10.1 | 9.9 | 8.8 | 8.9 | 7.9 | 7.5 |
| Precipitation (mm) | 24 | 48 | 133 | 99 | 265 | 345 | 164 | 234 | 266 | 107 | 51 | 34 |
| Sunny days | 16 | 15 | 12 | 16 | 13 | 4 | 7 | 0 | 3 | 12 | 15 | 21 |
| Rainy days | 6 | 8 | 19 | 14 | 18 | 26 | 24 | 31 | 27 | 19 | 15 | 7 |
| Snow days | 9 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
The largest precipitation sum in Karuizawa is at