Average annual temperature is 11.8 °C
Absolute maximum temperature: 35.0 °C
Absolute minimum temperature: -15.3 °C
Number of sunny days: 174 days
Number of rainy days: 178 days
Number of snow days: 13 days
Look at detailed online map of Koster
* Weather data for Koster United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 17.2 | 14.5 | 20.0 | 26.5 | 32.4 | 34.5 | 34.3 | 35.0 | 31.9 | 28.8 | 22.1 | 15.0 |
| Average daytime temperature (°C) | 4.4 | 7.4 | 8.8 | 17.7 | 24.0 | 28.9 | 28.7 | 27.0 | 24.5 | 17.8 | 11.0 | 7.5 |
| Average temperature (°C) | 0.5 | 1.7 | 3.4 | 10.5 | 17.2 | 21.8 | 23.0 | 21.8 | 19.2 | 13.0 | 5.4 | 3.7 |
| Average night temperature (°C) | -2.3 | -2.3 | -0.8 | 4.7 | 11.1 | 15.6 | 17.7 | 17.3 | 14.8 | 9.3 | 1.0 | 1.0 |
| Absolute minimum temperature (°C) | -13.8 | -15.3 | -11.2 | -3.3 | 1.9 | 8.9 | 13.1 | 10.9 | 8.0 | -3.0 | -10.1 | -7.9 |
| 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) | 3.3 | 7.8 | 6.6 | 9.4 | 10.8 | 12.2 | 12.1 | 10.8 | 8.4 | 6.6 | 7.0 | 4.3 |
| Precipitation (mm) | 57 | 88 | 129 | 65 | 88 | 28 | 144 | 90 | 89 | 146 | 27 | 80 |
| Sunny days | 10 | 17 | 9 | 15 | 19 | 18 | 11 | 14 | 13 | 11 | 23 | 14 |
| Rainy days | 14 | 9 | 21 | 15 | 12 | 12 | 20 | 17 | 17 | 19 | 7 | 15 |
| Snow days | 7 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 |
The best time to visit Koster during the most sunny months:
The largest precipitation sum in Koster is at