Average annual temperature is 8.1 °C
Absolute maximum temperature: 32.2 °C
Absolute minimum temperature: -31.9 °C
Number of sunny days: 137 days
Number of rainy days: 188 days
Number of snow days: 40 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) | 7.3 | 10.2 | 9.5 | 26.2 | 29.6 | 32.2 | 30.1 | 25.2 | 29.7 | 27.1 | 15.1 | 13.5 |
| Average daytime temperature (°C) | 1.5 | 1.4 | 3.9 | 12.8 | 18.8 | 21.4 | 25.4 | 22.7 | 20.9 | 15.6 | 5.5 | 4.3 |
| Average temperature (°C) | -2.1 | -4.4 | -0.7 | 7.0 | 12.2 | 16.2 | 20.8 | 18.2 | 16.4 | 11.2 | 1.0 | 0.3 |
| Average night temperature (°C) | -5.5 | -9.5 | -5.2 | 2.3 | 6.3 | 11.8 | 17.1 | 14.4 | 12.7 | 7.7 | -2.5 | -2.4 |
| Absolute minimum temperature (°C) | -14.1 | -31.9 | -10.6 | -5.3 | -1.4 | 5.5 | 11.5 | 9.4 | 6.6 | -2.1 | -8.9 | -10.7 |
| 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) | 9.4 | 10.5 | 11.9 | 13.4 | 14.7 | 15.4 | 15.0 | 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) | 3.2 | 6.3 | 6.7 | 7.8 | 11.3 | 8.8 | 10.1 | 10.0 | 8.2 | 6.4 | 6.6 | 4.5 |
| Precipitation (mm) | 115 | 54 | 97 | 90 | 79 | 156 | 216 | 142 | 99 | 107 | 49 | 148 |
| Sunny days | 6 | 12 | 9 | 13 | 19 | 3 | 2 | 8 | 17 | 15 | 19 | 14 |
| Rainy days | 10 | 7 | 12 | 16 | 12 | 27 | 29 | 23 | 13 | 16 | 8 | 15 |
| Snow days | 15 | 9 | 10 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 2 |
The best time to visit Sullivan County during the most sunny months:
Months with the longest average daylight duration in Sullivan County:
The largest precipitation sum in Sullivan County is at