Somerset County Climate
Somerset County, New Jersey
Avg Annual Temp
51.8°F
Annual Precip
47.3"
Annual Snowfall
21.0"
Extreme Heat Days
19.799999999999997
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Somerset County Weather
A Balanced Four-Season Climate
Somerset County's annual average temperature of 51.8°F sits just below the national median for temperate zones. It experiences the classic transition of seasons typical of the American Northeast.
Cooler than the Jersey Average
The county's 51.8°F average is nearly two degrees cooler than the New Jersey state average of 53.6°F. This difference reflects Somerset's position away from the warming influence of the southern coast.
A Middle Ground in Central Jersey
Somerset is warmer than rugged Sussex but cooler than coastal Union County. It averages 21.0 inches of snow annually, representing a midpoint between the snowy north and the milder south.
Cold Januaries and Hot Julys
January temperatures average 29.4°F, frequently dipping below freezing for extended periods. Summer brings 20 days of extreme heat above 90°F, making for a July average of 74.2°F.
Prepare for Ice and Humidity
Homeowners should ensure insulation is ready for the 21 inches of annual snowfall and freezing January nights. Dual-purpose HVAC units are essential to handle both the winter chill and the 20 days of summer heat spikes.
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.