Average annual temperature is 11.8 °C
Absolute maximum temperature: 36.5 °C
Absolute minimum temperature: -10.8 °C
Number of sunny days: 75 days
Number of rainy days: 241 days
Number of snow days: 49 days
Look at detailed online map of Isono
* Weather data for Isono 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) | 10.4 | 8.9 | 21.8 | 21.6 | 23.8 | 27.8 | 30.4 | 36.5 | 30.9 | 21.8 | 22.4 | 13.9 |
| Average daytime temperature (°C) | 0.8 | 1.9 | 9.6 | 12.9 | 17.6 | 22.8 | 26.1 | 30.8 | 25.7 | 17.7 | 11.4 | 3.8 |
| Average temperature (°C) | -1.5 | -0.2 | 5.5 | 9.3 | 13.3 | 19.1 | 23.1 | 26.9 | 22.0 | 14.2 | 8.1 | 1.3 |
| Average night temperature (°C) | -3.6 | -2.2 | 2.4 | 6.6 | 10.1 | 16.2 | 20.8 | 24.0 | 19.3 | 11.4 | 5.5 | -0.8 |
| Absolute minimum temperature (°C) | -10.8 | -7.8 | -3.8 | 1.6 | 4.2 | 12.8 | 16.4 | 21.5 | 12.8 | 5.5 | -2.5 | -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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 5.9 | 6.4 | 8.7 | 9.1 | 9.9 | 9.1 | 10.1 | 11.2 | 7.9 | 8.1 | 5.7 | 4.7 |
| Precipitation (mm) | 123 | 84 | 71 | 151 | 131 | 123 | 216 | 93 | 139 | 124 | 172 | 115 |
| Sunny days | 1 | 2 | 13 | 8 | 12 | 9 | 7 | 3 | 7 | 9 | 3 | 1 |
| Rainy days | 11 | 11 | 18 | 22 | 19 | 21 | 24 | 28 | 23 | 22 | 24 | 18 |
| Snow days | 19 | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 12 |
The best time to visit Isono during the most sunny months:
The largest precipitation sum in Isono is at