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Monongahela city, Pennsylvania

Official LSAD Designation: Monongahela city • Census GEOID: 4250408 • Washington County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Monongahela city.

Reference Weather Station: CHARLEROI LOCK 4, PA US (ID: USC00361377) • Located 3.3 miles from community center • Elevation: 228.3 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 39.0° 21.3° 30.2° 3.24"
February 42.1° 22.2° 32.2° 2.75"
March 51.4° 29.0° 40.2° 3.42"
April 64.1° 39.3° 51.7° 3.45"
May 73.5° 50.7° 62.1° 3.94"
June 81.1° 59.5° 70.3° 4.33"
July 85.0° 63.8° 74.4° 4.05"
August 83.7° 62.5° 73.1° 3.50"
September 77.8° 55.9° 66.9° 3.26"
October 66.0° 44.4° 55.2° 2.86"
November 53.7° 33.9° 43.8° 2.85"
December 43.4° 27.0° 35.2° 3.27"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station CHARLEROI LOCK 4, PA US (ID: USC00361377) • 3.3 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 CHARLEROI LOCK 4, 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. 38.0 45.8 53.5 61.3 69.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2011: Annual mean 53.3°F 2013: Annual mean 51.9°F 2014: Annual mean 51.1°F 2015: Annual mean 53.7°F 2017: Annual mean 54.8°F 2019: Annual mean 54.4°F 2020: Annual mean 54.7°F 2022: Annual mean 53.4°F 2023: Annual mean 55.1°F 2025: Annual mean 53.8°F 2011: Annual mean of daily highs 62.1°F 2013: Annual mean of daily highs 60.6°F 2014: Annual mean of daily highs 60.9°F 2015: Annual mean of daily highs 63.5°F 2017: Annual mean of daily highs 64.8°F 2019: Annual mean of daily highs 64.4°F 2020: Annual mean of daily highs 65.1°F 2022: Annual mean of daily highs 64.4°F 2023: Annual mean of daily highs 65.9°F 2025: Annual mean of daily highs 64.5°F 2011: Annual mean of daily lows 44.5°F 2013: Annual mean of daily lows 43.2°F 2014: Annual mean of daily lows 41.3°F 2015: Annual mean of daily lows 44.0°F 2017: Annual mean of daily lows 44.9°F 2018: Annual mean of daily lows 44.4°F 2019: Annual mean of daily lows 44.3°F 2020: Annual mean of daily lows 44.4°F 2022: Annual mean of daily lows 42.3°F 2023: Annual mean of daily lows 44.2°F 2025: Annual mean of daily lows 43.1°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 Unavailable Unavailable Unavailable
2011 53.3 62.1 44.5
2012 Unavailable Unavailable Unavailable
2013 51.9 60.6 43.2
2014 51.1 60.9 41.3
2015 53.7 63.5 44.0
2016 Unavailable Unavailable Unavailable
2017 54.8 64.8 44.9
2018 Unavailable Unavailable 44.4
2019 54.4 64.4 44.3
2020 54.7 65.1 44.4
2021 Unavailable Unavailable Unavailable
2022 53.4 64.4 42.3
2023 55.1 65.9 44.2
2024 Unavailable Unavailable Unavailable
2025 53.8 64.5 43.1
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.