Union County Climate
Union County, Pennsylvania
Avg Annual Temp
51.1°F
Annual Precip
43.9"
Annual Snowfall
28.8"
Extreme Heat Days
18.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Union County Weather
Typical Mid-Atlantic Warmth and Humidity
Union County averages 51.1°F annually, which is slightly above the national median. It experiences a humid continental climate with a notable amount of summer heat days.
Warmer Than the Pennsylvania Average
Union’s 51.1°F average temperature exceeds the state average of 49.9°F. It is also one of the drier counties in the state, receiving 43.9 inches of precipitation compared to the 45.3-inch average.
The Warmest in the Immediate Region
Union is slightly warmer than neighboring Snyder County, averaging 51.1°F annually. It also sees the least snow in the local group, with only 28.8 inches per year.
Hot Summers and Brisk, Light Winters
Summer is pronounced here, featuring 18 days above 90°F and a July average of 73.3°F. Winters are relatively mild for the state, with a January average of 27.8°F and under 30 inches of snow.
Invest in High-Efficiency Summer Cooling
With 18 extreme heat days, a well-maintained air conditioning system is vital for comfort and safety. Winter needs are moderate, as the county receives only 28.8 inches of snow, the lowest in this eight-county set.
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.