Average annual temperature is 9.1 °C
Absolute maximum temperature: 30.8 °C
Absolute minimum temperature: -20.4 °C
Number of sunny days: 143 days
Number of rainy days: 197 days
Number of snow days: 25 days
Look at detailed online map of Sullivan County
* Weather data for Sullivan 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) | 13.1 | 14.5 | 12.5 | 26.5 | 28.2 | 30.0 | 30.8 | 27.3 | 30.0 | 25.0 | 15.3 | 10.4 |
| Average daytime temperature (°C) | 3.5 | 5.3 | 5.7 | 15.2 | 18.7 | 22.2 | 26.1 | 23.3 | 21.1 | 15.0 | 6.6 | 4.7 |
| Average temperature (°C) | 0.3 | -0.5 | 0.7 | 9.2 | 12.0 | 16.8 | 20.9 | 18.5 | 16.1 | 10.7 | 2.2 | 1.4 |
| Average night temperature (°C) | -2.3 | -5.0 | -3.2 | 4.0 | 6.0 | 12.2 | 16.6 | 14.6 | 12.2 | 7.3 | -1.2 | -1.1 |
| Absolute minimum temperature (°C) | -8.8 | -20.4 | -9.3 | -4.5 | -1.1 | 6.8 | 12.4 | 10.4 | 6.8 | -1.9 | -8.1 | -6.7 |
| 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 | 9.2 |
| 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 | 6.3 | 6.7 | 8.6 | 11.6 | 11.0 | 11.4 | 10.0 | 8.7 | 7.1 | 6.7 | 3.2 |
| Precipitation (mm) | 103 | 44 | 100 | 111 | 34 | 92 | 105 | 147 | 82 | 74 | 49 | 118 |
| Sunny days | 7 | 11 | 10 | 14 | 20 | 8 | 7 | 9 | 15 | 14 | 18 | 10 |
| Rainy days | 18 | 12 | 16 | 15 | 11 | 22 | 24 | 22 | 15 | 17 | 9 | 16 |
| Snow days | 6 | 5 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 5 |
The best time to visit Sullivan County during the most sunny months:
The largest precipitation sum in Sullivan County is at