Union County Climate
Union County, Pennsylvania
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.1°F
Annual Precip
43.9"
Annual Snowfall
28.8"
Extreme Heat Days
18
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,042
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Union County
Climate Verdict
Union County has a mild, with an average annual temperature of 51.1°F, moderately wet with 43.9 inches of annual precipitation, rare extreme heat with only 18.4 days above 90°F annually, moderate snowfall of 28.8 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 27.8°F. summers are warm — July averages 73.3°F. The 46°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Union County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Union County closely matches the Pennsylvania statewide average temperature of 49.8°F.
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
What is the average temperature in Union County?
How much rain does Union County get?
Does it snow in Union County?
How hot does Union County get in summer?
How cold are winters in Union County?
Track your own weather in Union County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.