Average annual temperature is 16.5 °C
Absolute maximum temperature: 35.2 °C
Absolute minimum temperature: -3.3 °C
Number of sunny days: 181 days
Number of rainy days: 183 days
Number of snow days: 1 day
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) | 16.3 | 13.7 | 20.2 | 22.0 | 27.0 | 27.8 | 32.1 | 35.2 | 33.0 | 27.5 | 25.0 | 19.4 |
| Average daytime temperature (°C) | 9.5 | 9.9 | 15.5 | 18.1 | 22.1 | 24.7 | 28.1 | 30.9 | 29.0 | 22.7 | 17.3 | 11.8 |
| Average temperature (°C) | 5.8 | 6.1 | 10.8 | 14.0 | 18.2 | 21.7 | 25.9 | 28.0 | 25.8 | 18.6 | 13.9 | 8.7 |
| Average night temperature (°C) | 2.5 | 2.2 | 6.5 | 10.1 | 14.7 | 18.9 | 23.8 | 25.5 | 23.2 | 15.1 | 10.8 | 5.7 |
| Absolute minimum temperature (°C) | -3.3 | -2.0 | -0.3 | 6.2 | 8.3 | 13.8 | 20.7 | 23.5 | 19.6 | 11.9 | 5.9 | 0.2 |
| 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) | 7.3 | 6.7 | 8.4 | 7.8 | 8.8 | 7.7 | 9.4 | 9.9 | 9.2 | 8.5 | 8.1 | 7.0 |
| Precipitation (mm) | 63 | 66 | 82 | 219 | 202 | 222 | 155 | 134 | 63 | 10 | 42 | 53 |
| Sunny days | 17 | 14 | 20 | 17 | 15 | 11 | 14 | 8 | 6 | 24 | 17 | 18 |
| Rainy days | 13 | 14 | 11 | 13 | 16 | 19 | 17 | 23 | 24 | 7 | 13 | 13 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Koyō is at