Chester County Climate
Chester County, Pennsylvania
Avg Annual Temp
52.9°F
Annual Precip
48.8"
Annual Snowfall
28.5"
Extreme Heat Days
19.08
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Chester County Weather
A Near National Median Climate
Chester County averages 52.9°F, aligning closely with the national median temperature. This region enjoys the mildest climate profile in the Pennsylvania area.
One of Pennsylvania's Warmest Counties
At 52.9°F, Chester County is significantly warmer than the state average of 49.9°F. It ranks among the top tier of counties for annual heat and mild winters.
Milder Than Neighboring Bucks County
Chester is slightly warmer than its neighbor Bucks County, which averages 52.3°F. It receives 48.8 inches of rain, exceeding the state average of 45.3 inches.
Hot Summers and Manageable Winters
July averages 75.0°F with 19 days of extreme heat reaching 90°F or higher. Winters are mild for Pennsylvania, seeing 28.5 inches of snow and a 32.8°F average.
Prepare for Heat and Moisture
Efficient air conditioning is a necessity to manage nearly 20 days of extreme summer heat. Property owners should also plan for heavy rain given the 48.8-inch annual precipitation.
Frequently Asked Questions
What is the average temperature in Chester County?
How much rain does Chester County get?
Does it snow in Chester County?
How hot does Chester County get in summer?
How cold are winters in Chester County?
Track your own weather in Chester County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.