Average annual temperature is 8.6 °C
Absolute maximum temperature: 36.1 °C
Absolute minimum temperature: -31.6 °C
Number of sunny days: 229 days
Number of rainy days: 105 days
Number of snow days: 31 days
Look at detailed online map of Sully County
* Weather data for Sully 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) | 3.9 | 12.1 | 13.4 | 26.5 | 29.5 | 36.1 | 36.0 | 35.1 | 34.5 | 29.6 | 14.7 | 12.8 |
| Average daytime temperature (°C) | -2.7 | 1.5 | 1.9 | 10.1 | 23.8 | 28.5 | 28.8 | 28.7 | 25.2 | 14.6 | 8.0 | 4.1 |
| Average temperature (°C) | -7.1 | -5.4 | -4.2 | 3.5 | 17.2 | 22.5 | 22.5 | 22.6 | 19.2 | 9.2 | 2.5 | -0.7 |
| Average night temperature (°C) | -10.2 | -9.8 | -8.1 | -1.6 | 11.2 | 17.0 | 17.0 | 17.7 | 14.3 | 4.9 | -1.3 | -4.1 |
| Absolute minimum temperature (°C) | -24.4 | -31.6 | -19.4 | -14.7 | -1.5 | 10.9 | 12.1 | 13.2 | 9.6 | -9.0 | -11.0 | -12.7 |
| 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) | 9.3 | 10.4 | 11.9 | 13.5 | 14.8 | 15.5 | 15.2 | 14.0 | 12.5 | 11.0 | 9.6 | 8.9 |
| Daylight minimum duration (h) | 8.0 | 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) | 4.4 | 8.2 | 7.8 | 9.4 | 12.2 | 12.3 | 13.1 | 11.4 | 10.2 | 7.4 | 7.7 | 5.6 |
| Precipitation (mm) | 11 | 24 | 46 | 42 | 56 | 61 | 39 | 122 | 40 | 49 | 6 | 38 |
| Sunny days | 22 | 22 | 18 | 17 | 16 | 11 | 16 | 21 | 20 | 18 | 24 | 24 |
| Rainy days | 3 | 1 | 3 | 9 | 15 | 19 | 15 | 10 | 10 | 12 | 4 | 4 |
| Snow days | 6 | 5 | 10 | 4 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 |
The best time to visit Sully County during the most sunny months:
Months with the longest average daylight duration in Sully County:
The largest precipitation sum in Sully County is at