Sullivan County Climate
Sullivan County, New York
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
45.6°F
Annual Precip
53.4"
Annual Snowfall
63.9"
Extreme Heat Days
3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,093
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 45.6°F annually, moderately wet with 53.4 inches of annual precipitation, rare extreme heat with only 2.95 days above 90°F annually, heavy winter snowfall averaging 63.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 22.4°F. summers are pleasantly cool with July averaging 68.3°F. The 46°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 closely matches the New York statewide average temperature of 47.5°F, it is also noticeably wetter, receiving 10.1 inches more precipitation than the state average.
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 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.