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Mason City city, Illinois

Official LSAD Designation: Mason City city • Census GEOID: 1747475 • Mason County

Climate Normals & Weather Observations

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

Reference Weather Station: MASON CITY 4SE, IL US (ID: USC00115413) • Located 3.6 miles from community center • Elevation: 182.9 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 33.1° 16.2° 24.6° 2.34"
February 37.9° 19.4° 28.6° 1.96"
March 50.6° 29.5° 40.1° 2.49"
April 64.3° 41.2° 52.8° 3.73"
May 73.7° 52.8° 63.3° 4.47"
June 82.4° 61.8° 72.1° 4.20"
July 85.2° 64.6° 74.9° 5.14"
August 83.5° 62.1° 72.8° 3.57"
September 78.7° 53.9° 66.3° 3.55"
October 65.8° 42.9° 54.3° 3.33"
November 50.9° 30.5° 40.7° 2.78"
December 37.8° 21.7° 29.8° 1.70"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station PETERSBURG 1E, IL US (ID: USC00116765) • 14.8 miles from community center .

This annual reference station differs from the monthly normals station (ID: USC00115413), which has no available annual mean history.

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.