Average annual temperature is 12.6 °C
Absolute maximum temperature: 33.7 °C
Absolute minimum temperature: -11.3 °C
Number of sunny days: 158 days
Number of rainy days: 191 days
Number of snow days: 16 days
Look at detailed online map of Nagano-ken
* Weather data for Nagano-ken 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) | 15.0 | 13.1 | 21.1 | 25.1 | 28.7 | 29.0 | 33.7 | 32.5 | 32.4 | 25.3 | 23.0 | 16.6 |
| Average daytime temperature (°C) | 6.2 | 7.5 | 14.0 | 17.0 | 20.4 | 24.1 | 29.4 | 31.0 | 28.4 | 18.6 | 14.6 | 9.8 |
| Average temperature (°C) | 0.6 | 1.7 | 7.3 | 10.7 | 14.6 | 19.0 | 23.9 | 25.1 | 22.7 | 12.7 | 8.7 | 3.8 |
| Average night temperature (°C) | -3.2 | -2.5 | 1.7 | 5.1 | 9.5 | 14.7 | 19.3 | 20.5 | 18.4 | 8.1 | 4.5 | 0.1 |
| Absolute minimum temperature (°C) | -11.3 | -7.0 | -4.5 | -0.5 | 1.5 | 7.2 | 16.0 | 18.3 | 11.6 | 3.5 | -1.5 | -4.4 |
| 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 | 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 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| 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) | 7.4 | 7.2 | 8.6 | 9.0 | 9.1 | 8.2 | 9.8 | 11.2 | 9.0 | 8.7 | 7.4 | 6.9 |
| Precipitation (mm) | 30 | 80 | 112 | 137 | 222 | 264 | 86 | 77 | 103 | 87 | 70 | 57 |
| Sunny days | 18 | 13 | 15 | 16 | 17 | 8 | 4 | 8 | 5 | 19 | 17 | 18 |
| Rainy days | 6 | 10 | 16 | 14 | 14 | 22 | 27 | 23 | 25 | 12 | 13 | 9 |
| Snow days | 7 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
The best time to visit Nagano-ken during the most sunny months:
The largest precipitation sum in Nagano-ken is at