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Unionville CDP, Pennsylvania

Official LSAD Designation: Unionville CDP • Census GEOID: 4278624 • Chester County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Unionville CDP.

Reference Weather Station: AVONDALE 2 N, PA US (ID: USW00003761) • Located 4.1 miles from community center • Elevation: 121.9 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 38.6° 22.7° 30.6° 3.62"
February 41.2° 24.0° 32.6° 3.12"
March 49.8° 31.0° 40.4° 4.40"
April 61.5° 40.2° 50.8° 3.79"
May 71.2° 50.2° 60.7° 3.58"
June 79.5° 59.0° 69.2° 4.43"
July 83.6° 63.7° 73.6° 4.17"
August 81.5° 61.9° 71.7° 4.28"
September 75.3° 55.2° 65.2° 4.47"
October 63.9° 43.8° 53.9° 4.03"
November 53.3° 34.3° 43.8° 3.22"
December 43.2° 27.6° 35.4° 4.03"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station AVONDALE 2 N, PA US (ID: USW00003761) • 4.1 miles from community center .

This is the same reference station used for monthly normals.

Annual mean Annual mean of daily highs Annual mean of daily lows
Annual temperature history at AVONDALE 2 N, PA US Year is the horizontal axis. Annual mean temperature in degrees Fahrenheit is the vertical axis. Dots show recorded years; lines connect consecutive available years only. Missing years are gaps, with no interpolation. Optional dashed lines show annual mean of daily highs and lows. Exact values appear in the data table below. 40.0 46.8 53.5 60.3 67.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 53.0°F 2011: Annual mean 53.4°F 2012: Annual mean 54.3°F 2013: Annual mean 52.0°F 2015: Annual mean 52.6°F 2016: Annual mean 53.6°F 2017: Annual mean 53.6°F 2020: Annual mean 54.3°F 2023: Annual mean 54.3°F 2024: Annual mean 54.6°F 2025: Annual mean 52.7°F 2010: Annual mean of daily highs 62.4°F 2011: Annual mean of daily highs 62.7°F 2012: Annual mean of daily highs 63.9°F 2013: Annual mean of daily highs 61.0°F 2015: Annual mean of daily highs 62.2°F 2016: Annual mean of daily highs 63.5°F 2017: Annual mean of daily highs 62.9°F 2020: Annual mean of daily highs 63.6°F 2023: Annual mean of daily highs 64.3°F 2024: Annual mean of daily highs 64.2°F 2025: Annual mean of daily highs 62.1°F 2010: Annual mean of daily lows 43.6°F 2011: Annual mean of daily lows 44.1°F 2012: Annual mean of daily lows 44.8°F 2013: Annual mean of daily lows 42.9°F 2015: Annual mean of daily lows 43.0°F 2016: Annual mean of daily lows 43.7°F 2017: Annual mean of daily lows 44.4°F 2020: Annual mean of daily lows 44.9°F 2023: Annual mean of daily lows 44.3°F 2024: Annual mean of daily lows 44.9°F 2025: Annual mean of daily lows 43.3°F

Source: NOAA NCEI Global Summary of the Year.

Annual temperature data table (°F)
Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year Annual mean (°F) Annual mean of daily highs (°F) Annual mean of daily lows (°F)
2010 53.0 62.4 43.6
2011 53.4 62.7 44.1
2012 54.3 63.9 44.8
2013 52.0 61.0 42.9
2014 Unavailable Unavailable Unavailable
2015 52.6 62.2 43.0
2016 53.6 63.5 43.7
2017 53.6 62.9 44.4
2018 Unavailable Unavailable Unavailable
2019 Unavailable Unavailable Unavailable
2020 54.3 63.6 44.9
2021 Unavailable Unavailable Unavailable
2022 Unavailable Unavailable Unavailable
2023 54.3 64.3 44.3
2024 54.6 64.2 44.9
2025 52.7 62.1 43.3
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.