Average annual temperature is 15.6 °C
Absolute maximum temperature: 35.5 °C
Absolute minimum temperature: -5.8 °C
Number of sunny days: 151 days
Number of rainy days: 210 days
Number of snow days: 4 days
Look at detailed online map of Koi
* Weather data for Koi 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) | 17.4 | 17.1 | 23.5 | 26.5 | 31.8 | 30.9 | 35.5 | 33.0 | 32.7 | 27.2 | 25.3 | 19.7 |
| Average daytime temperature (°C) | 9.0 | 10.3 | 17.0 | 19.2 | 22.8 | 26.2 | 30.8 | 29.7 | 29.1 | 21.6 | 16.9 | 12.1 |
| Average temperature (°C) | 4.3 | 5.7 | 10.9 | 14.0 | 17.7 | 21.7 | 25.9 | 25.8 | 24.5 | 16.6 | 12.0 | 7.5 |
| Average night temperature (°C) | 0.7 | 2.0 | 6.2 | 9.5 | 13.2 | 17.9 | 22.3 | 23.2 | 21.2 | 13.0 | 8.1 | 4.2 |
| Absolute minimum temperature (°C) | -5.8 | -2.7 | -0.6 | 4.1 | 5.9 | 13.0 | 19.9 | 21.0 | 18.0 | 8.4 | 1.1 | -1.3 |
| 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) | 7.5 | 7.4 | 8.3 | 8.1 | 8.4 | 6.7 | 9.9 | 8.2 | 9.1 | 8.9 | 7.6 | 7.4 |
| Precipitation (mm) | 73 | 59 | 171 | 284 | 256 | 476 | 83 | 492 | 79 | 89 | 119 | 74 |
| Sunny days | 19 | 17 | 12 | 12 | 12 | 10 | 4 | 1 | 11 | 17 | 16 | 20 |
| Rainy days | 10 | 10 | 19 | 18 | 19 | 20 | 27 | 30 | 19 | 14 | 14 | 10 |
| Snow days | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The largest precipitation sum in Koi is at