Middlesex County Climate
Middlesex County, New Jersey
Avg Annual Temp
53.7°F
Annual Precip
49.5"
Annual Snowfall
29.0"
Extreme Heat Days
23.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Middlesex County Weather
Slightly warmer than the national median
With an annual average of 53.7°F, Middlesex County is slightly warmer than the typical U.S. county. Its climate is classified as humid subtropical, featuring distinct and active seasons.
Aligning with state-wide averages
Middlesex nearly mirrors the New Jersey average of 53.6°F. This makes its weather patterns highly representative of the state’s central corridor.
Higher snowfall than western neighbors
Middlesex sees 29.0 inches of snow, outpacing Mercer County’s 25.1 inches. It also receives about 3 inches more rain annually than the Mercer region.
Summer peaks and winter freezes
The county endures 24 days of extreme heat each year, typically concentrated in the 76.1°F July period. Winters stay cold with a January average of 31.6°F.
Prepare for significant winter accumulation
Because snowfall approaches 30 inches, residents should prioritize heavy-duty winter tires and salt. Efficient air conditioning is also needed for the 24 days of 90-degree weather.
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.