Average annual temperature is 10.2 °C
Absolute maximum temperature: 37.8 °C
Absolute minimum temperature: -30.0 °C
Number of sunny days: 223 days
Number of rainy days: 106 days
Number of snow days: 36 days
Look at detailed online map of Mellette County
* Weather data for Mellette 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) | 8.3 | 14.0 | 21.4 | 29.0 | 30.3 | 35.1 | 37.2 | 37.8 | 37.1 | 31.3 | 21.9 | 16.8 |
| Average daytime temperature (°C) | -0.6 | 4.4 | 6.5 | 12.8 | 23.9 | 27.8 | 30.0 | 30.3 | 27.1 | 16.4 | 10.9 | 5.9 |
| Average temperature (°C) | -4.6 | -2.6 | -0.9 | 6.2 | 17.5 | 22.0 | 23.6 | 24.0 | 20.6 | 10.4 | 4.7 | 0.8 |
| Average night temperature (°C) | -8.0 | -7.2 | -5.2 | 1.0 | 11.7 | 16.6 | 17.5 | 18.7 | 15.4 | 5.8 | 0.4 | -2.8 |
| Absolute minimum temperature (°C) | -24.5 | -30.0 | -12.4 | -11.5 | 0.6 | 10.6 | 11.8 | 13.5 | 9.4 | -9.6 | -8.3 | -15.0 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.4 | 10.5 | 11.9 | 13.4 | 14.7 | 15.4 | 15.1 | 13.9 | 12.5 | 11.0 | 9.7 | 9.0 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 5.1 | 7.9 | 8.2 | 9.5 | 11.7 | 11.9 | 13.1 | 11.6 | 10.5 | 7.6 | 7.2 | 5.6 |
| Precipitation (mm) | 44 | 26 | 33 | 44 | 110 | 143 | 55 | 61 | 35 | 132 | 8 | 46 |
| Sunny days | 19 | 18 | 17 | 18 | 16 | 12 | 16 | 23 | 18 | 20 | 24 | 22 |
| Rainy days | 5 | 6 | 2 | 7 | 15 | 18 | 15 | 8 | 12 | 10 | 3 | 5 |
| Snow days | 7 | 4 | 12 | 5 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 4 |
The best time to visit Mellette County during the most sunny months:
Months with the longest average daylight duration in Mellette County:
The largest precipitation sum in Mellette County is at