Average annual temperature is 16.7 °C
Absolute maximum temperature: 29.2 °C
Absolute minimum temperature: -1.6 °C
Number of sunny days: 188 days
Number of rainy days: 174 days
Number of snow days: 3 days
Look at detailed online map of Koyō
* Weather data for Koyō 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) | 15.1 | 14.2 | 15.7 | 18.4 | 20.5 | 24.2 | 26.7 | 29.2 | 28.4 | 26.3 | 24.6 | 20.0 |
| Average daytime temperature (°C) | 9.8 | 9.6 | 12.7 | 15.3 | 18.2 | 21.1 | 25.1 | 27.5 | 26.9 | 22.2 | 17.6 | 12.4 |
| Average temperature (°C) | 7.8 | 7.8 | 11.1 | 13.6 | 16.8 | 20.0 | 24.0 | 26.4 | 25.6 | 20.1 | 15.7 | 10.6 |
| Average night temperature (°C) | 5.9 | 5.4 | 9.2 | 11.9 | 15.6 | 19.0 | 22.9 | 25.4 | 24.3 | 18.3 | 13.2 | 8.6 |
| Absolute minimum temperature (°C) | -1.6 | 1.7 | 4.4 | 9.2 | 12.2 | 15.6 | 20.6 | 24.1 | 22.7 | 15.1 | 8.0 | 2.3 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.2 | 11.0 | 12.0 | 13.0 | 13.9 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 7.6 | 7.0 | 8.7 | 8.1 | 9.1 | 7.7 | 9.7 | 10.2 | 9.5 | 8.6 | 8.0 | 7.1 |
| Precipitation (mm) | 63 | 54 | 98 | 223 | 233 | 227 | 161 | 88 | 37 | 25 | 60 | 69 |
| Sunny days | 16 | 13 | 20 | 17 | 16 | 14 | 17 | 13 | 13 | 21 | 16 | 12 |
| Rainy days | 14 | 15 | 11 | 13 | 15 | 16 | 14 | 18 | 17 | 10 | 14 | 17 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The largest precipitation sum in Koyō is at