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Lake Petersburg CDP, Illinois

Official LSAD Designation: Lake Petersburg CDP • Census GEOID: 1741404 • Menard County

Climate Normals & Weather Observations

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

Reference Weather Station: PETERSBURG 1E, IL US (ID: USC00116765) • Located 2.5 miles from community center • Elevation: 182.9 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 34.4° 17.3° 25.9° 2.02"
February 39.3° 20.5° 29.9° 1.75"
March 50.8° 30.3° 40.6° 2.51"
April 63.7° 41.3° 52.5° 4.09"
May 73.7° 53.3° 63.5° 4.61"
June 82.2° 62.3° 72.3° 4.14"
July 85.5° 65.4° 75.5° 3.87"
August 84.5° 62.7° 73.6° 3.66"
September 78.8° 54.9° 66.9° 3.12"
October 66.3° 43.0° 54.7° 3.19"
November 51.5° 32.1° 41.8° 2.76"
December 39.1° 22.6° 30.9° 1.93"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station PETERSBURG 1E, IL US (ID: USC00116765) • 2.5 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 PETERSBURG 1E, IL 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. 39.0 46.3 53.5 60.8 68.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2015: Annual mean 52.3°F 2017: Annual mean 54.5°F 2018: Annual mean 52.5°F 2020: Annual mean 53.3°F 2021: Annual mean 54.0°F 2022: Annual mean 52.1°F 2023: Annual mean 54.3°F 2024: Annual mean 55.1°F 2025: Annual mean 53.8°F 2015: Annual mean of daily highs 62.2°F 2016: Annual mean of daily highs 63.8°F 2017: Annual mean of daily highs 65.1°F 2018: Annual mean of daily highs 62.5°F 2020: Annual mean of daily highs 63.3°F 2021: Annual mean of daily highs 63.2°F 2022: Annual mean of daily highs 62.3°F 2023: Annual mean of daily highs 65.4°F 2024: Annual mean of daily highs 65.6°F 2025: Annual mean of daily highs 64.5°F 2015: Annual mean of daily lows 42.3°F 2017: Annual mean of daily lows 44.0°F 2018: Annual mean of daily lows 42.4°F 2020: Annual mean of daily lows 43.3°F 2021: Annual mean of daily lows 44.8°F 2022: Annual mean of daily lows 41.9°F 2023: Annual mean of daily lows 43.2°F 2024: Annual mean of daily lows 44.7°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 Unavailable Unavailable Unavailable
2012 Unavailable Unavailable Unavailable
2013 Unavailable Unavailable Unavailable
2014 Unavailable Unavailable Unavailable
2015 52.3 62.2 42.3
2016 Unavailable 63.8 Unavailable
2017 54.5 65.1 44.0
2018 52.5 62.5 42.4
2019 Unavailable Unavailable Unavailable
2020 53.3 63.3 43.3
2021 54.0 63.2 44.8
2022 52.1 62.3 41.9
2023 54.3 65.4 43.2
2024 55.1 65.6 44.7
2025 53.8 64.5 43.1
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.