Sullivan County Climate
Sullivan County, Pennsylvania
Avg Annual Temp
45.5°F
Annual Precip
48.4"
Annual Snowfall
55.5"
Extreme Heat Days
1.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sullivan County Weather
A Cold and Wet Mountain Climate
Sullivan County averages 45.5°F annually, making it significantly colder than the U.S. median. With 48.4 inches of annual precipitation, it is also wetter than the average American county.
Well Below the State Temperature Mark
Sullivan's 45.5°F average is much lower than the Pennsylvania state average of 49.9°F. It also receives more annual precipitation than the state average, totaling 48.4 inches compared to 45.3 inches.
Similar Temperatures to Nearby Susquehanna
Sullivan's annual average of 45.5°F is nearly identical to Susquehanna County's 45.2°F. However, Sullivan receives about 10 inches less snow per year than Susquehanna, averaging 55.5 inches.
Cold Winters With Minimal Heat Waves
Winters feature a January average of 22.5°F and over 55 inches of snow. High heat is almost non-existent, with the county typically recording only one day per year reaching 90°F.
Focus on Winter Resilience and Waterproofing
Reliable home heating and winter vehicle prep are mandatory for the long 25.0°F winter season. Given the 48.4 inches of precipitation, ensuring proper property drainage and roof integrity is critical.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.