Sullivan County Climate
Sullivan County, New York
Avg Annual Temp
45.6°F
Annual Precip
53.4"
Annual Snowfall
63.9"
Extreme Heat Days
2.95
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sullivan County Weather
Sullivan's Cool Montane Climate
At 45.6°F, Sullivan County's annual average temperature sits nearly 8 degrees below the national median. This reflects its high-elevation, humid continental climate characterized by long, cool periods.
Cooler and Wetter Than the Average
Sullivan's 45.6°F average is nearly two degrees cooler than the New York state average of 47.4°F. The county also sees significantly more moisture, recording 53.4 inches of precipitation compared to the 43.3-inch state benchmark.
A Rain Magnet in the Catskills
Sullivan is one of the wettest counties in the region, out-precipitating many neighbors with its 53.4 inches of annual rainfall. This moisture fuels its lush summer landscape but leads to heavy winter accumulations.
Deep Snow and Mild Summers
Sullivan experiences 63.9 inches of annual snowfall, with January temperatures averaging a chilly 22.4°F. In contrast, summers remain exceptionally pleasant with only 3 days per year reaching the 90°F mark.
Gear Up for a Long Winter
Homeowners should prioritize high-efficiency heating systems to combat the 24.6°F winter average. Proper drainage and gutter maintenance are essential to handle the high annual precipitation levels.
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.