Average annual temperature is 16.3 °C
Absolute maximum temperature: 40.1 °C
Absolute minimum temperature: -14.1 °C
Number of sunny days: 244 days
Number of rainy days: 118 days
Number of snow days: 3 days
Look at detailed online map of Dewey County
* Weather data for Dewey County 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) | 20.9 | 22.6 | 26.7 | 31.9 | 32.2 | 38.1 | 37.5 | 40.1 | 39.8 | 32.0 | 27.0 | 19.9 |
| Average daytime temperature (°C) | 11.8 | 13.1 | 16.7 | 23.0 | 25.9 | 30.0 | 33.8 | 35.2 | 31.5 | 23.2 | 16.3 | 12.2 |
| Average temperature (°C) | 5.0 | 5.6 | 9.4 | 15.2 | 20.0 | 24.0 | 27.6 | 28.9 | 25.2 | 17.2 | 10.1 | 7.0 |
| Average night temperature (°C) | 0.3 | 0.5 | 3.6 | 9.2 | 15.2 | 18.9 | 22.6 | 22.9 | 20.0 | 12.1 | 5.3 | 3.0 |
| Absolute minimum temperature (°C) | -14.1 | -9.0 | -5.7 | 1.2 | 5.7 | 15.0 | 17.6 | 16.2 | 15.0 | -2.3 | -4.5 | -3.1 |
| 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 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.6 | 7.9 | 9.1 | 10.1 | 10.3 | 11.4 | 12.0 | 12.3 | 10.0 | 9.0 | 7.7 | 6.8 |
| Precipitation (mm) | 20 | 11 | 6 | 55 | 86 | 175 | 86 | 1 | 45 | 31 | 43 | 54 |
| Sunny days | 25 | 21 | 23 | 21 | 11 | 8 | 18 | 26 | 22 | 23 | 24 | 22 |
| Rainy days | 5 | 7 | 8 | 9 | 20 | 22 | 13 | 5 | 8 | 8 | 5 | 8 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Dewey County during the most sunny months:
The largest precipitation sum in Dewey County is at