Sullivan County Climate
Sullivan County, Pennsylvania
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
45.5°F
Annual Precip
48.4"
Annual Snowfall
55.5"
Extreme Heat Days
1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,072
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Sullivan County
Climate Verdict
Sullivan County has a cool, averaging 45.5°F annually, moderately wet with 48.4 inches of annual precipitation, rare extreme heat with only 1.4 days above 90°F annually, moderate snowfall of 55.5 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 22.5°F. summers are pleasantly cool with July averaging 67.8°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Sullivan County is 4.3°F cooler than the Pennsylvania statewide average of 49.8°F, it is somewhat wetter than average for Pennsylvania.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.