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Lake Summerset CDP, Illinois

Official LSAD Designation: Lake Summerset CDP • Census GEOID: 1741456 • Winnebago County

Climate Normals & Weather Observations

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

Reference Weather Station: BRODHEAD WWTP, WI US (ID: USC00471078) • Located 11.3 miles from community center • Elevation: 237.7 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 27.4° 10.5° 19.0° 1.59"
February 31.8° 13.6° 22.7° 1.75"
March 44.4° 24.6° 34.5° 2.11"
April 58.3° 35.4° 46.9° 3.73"
May 70.1° 47.1° 58.6° 4.18"
June 79.8° 57.4° 68.6° 5.56"
July 83.1° 61.0° 72.0° 4.00"
August 81.3° 58.9° 70.1° 4.35"
September 74.6° 50.1° 62.4° 3.78"
October 61.6° 38.8° 50.2° 2.94"
November 46.0° 27.8° 36.9° 2.35"
December 32.8° 17.2° 25.0° 1.96"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station BRODHEAD WWTP, WI US (ID: USC00471078) • 11.3 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 BRODHEAD WWTP, WI 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. 30.0 38.8 47.5 56.3 65.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 48.7°F 2011: Annual mean 47.6°F 2013: Annual mean 45.6°F 2014: Annual mean 44.0°F 2015: Annual mean 47.6°F 2016: Annual mean 49.8°F 2017: Annual mean 48.9°F 2018: Annual mean 47.1°F 2019: Annual mean 46.3°F 2020: Annual mean 47.2°F 2021: Annual mean 47.8°F 2022: Annual mean 46.3°F 2023: Annual mean 49.5°F 2024: Annual mean 50.7°F 2025: Annual mean 48.2°F 2010: Annual mean of daily highs 59.4°F 2011: Annual mean of daily highs 57.8°F 2013: Annual mean of daily highs 56.2°F 2014: Annual mean of daily highs 54.6°F 2015: Annual mean of daily highs 58.4°F 2016: Annual mean of daily highs 59.7°F 2017: Annual mean of daily highs 59.3°F 2018: Annual mean of daily highs 57.0°F 2019: Annual mean of daily highs 56.1°F 2020: Annual mean of daily highs 57.6°F 2021: Annual mean of daily highs 58.7°F 2022: Annual mean of daily highs 57.1°F 2023: Annual mean of daily highs 60.3°F 2024: Annual mean of daily highs 61.8°F 2025: Annual mean of daily highs 59.8°F 2010: Annual mean of daily lows 37.9°F 2011: Annual mean of daily lows 37.4°F 2013: Annual mean of daily lows 35.0°F 2014: Annual mean of daily lows 33.5°F 2015: Annual mean of daily lows 36.9°F 2016: Annual mean of daily lows 39.9°F 2017: Annual mean of daily lows 38.4°F 2018: Annual mean of daily lows 37.2°F 2019: Annual mean of daily lows 36.6°F 2020: Annual mean of daily lows 36.9°F 2021: Annual mean of daily lows 36.9°F 2022: Annual mean of daily lows 35.6°F 2023: Annual mean of daily lows 38.8°F 2024: Annual mean of daily lows 39.6°F 2025: Annual mean of daily lows 36.6°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 48.7 59.4 37.9
2011 47.6 57.8 37.4
2012 Unavailable Unavailable Unavailable
2013 45.6 56.2 35.0
2014 44.0 54.6 33.5
2015 47.6 58.4 36.9
2016 49.8 59.7 39.9
2017 48.9 59.3 38.4
2018 47.1 57.0 37.2
2019 46.3 56.1 36.6
2020 47.2 57.6 36.9
2021 47.8 58.7 36.9
2022 46.3 57.1 35.6
2023 49.5 60.3 38.8
2024 50.7 61.8 39.6
2025 48.2 59.8 36.6
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.