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Mason town, Illinois

Official LSAD Designation: Mason town • Census GEOID: 1747449 • Effingham County

Climate Normals & Weather Observations

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

Reference Weather Station: EFFINGHAM 3SW, IL US (ID: USC00112687) • Located 11.3 miles from community center • Elevation: 190.5 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 37.4° 20.1° 28.8° 2.93"
February 42.5° 23.4° 33.0° 2.44"
March 53.5° 32.4° 42.9° 3.30"
April 65.9° 42.4° 54.2° 4.84"
May 76.2° 53.6° 64.9° 5.27"
June 85.1° 62.8° 74.0° 4.87"
July 88.5° 66.0° 77.2° 4.29"
August 87.2° 63.7° 75.4° 3.19"
September 81.2° 55.5° 68.4° 2.89"
October 68.8° 44.1° 56.4° 3.49"
November 54.0° 33.7° 43.9° 3.73"
December 42.2° 25.4° 33.8° 2.77"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station EFFINGHAM 3SW, IL US (ID: USC00112687) • 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 EFFINGHAM 3SW, 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. 37.0 45.8 54.5 63.3 72.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 54.1°F 2011: Annual mean 54.4°F 2012: Annual mean 56.6°F 2013: Annual mean 52.4°F 2014: Annual mean 50.9°F 2015: Annual mean 54.2°F 2016: Annual mean 56.7°F 2017: Annual mean 56.5°F 2018: Annual mean 54.7°F 2019: Annual mean 54.2°F 2010: Annual mean of daily highs 65.2°F 2011: Annual mean of daily highs 64.6°F 2012: Annual mean of daily highs 68.3°F 2013: Annual mean of daily highs 62.9°F 2014: Annual mean of daily highs 61.8°F 2015: Annual mean of daily highs 65.0°F 2016: Annual mean of daily highs 67.2°F 2017: Annual mean of daily highs 67.8°F 2018: Annual mean of daily highs 65.1°F 2019: Annual mean of daily highs 64.8°F 2010: Annual mean of daily lows 42.9°F 2011: Annual mean of daily lows 44.1°F 2012: Annual mean of daily lows 44.9°F 2013: Annual mean of daily lows 41.8°F 2014: Annual mean of daily lows 40.0°F 2015: Annual mean of daily lows 43.4°F 2016: Annual mean of daily lows 46.2°F 2017: Annual mean of daily lows 45.2°F 2018: Annual mean of daily lows 44.2°F 2019: Annual mean of daily lows 43.6°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 54.1 65.2 42.9
2011 54.4 64.6 44.1
2012 56.6 68.3 44.9
2013 52.4 62.9 41.8
2014 50.9 61.8 40.0
2015 54.2 65.0 43.4
2016 56.7 67.2 46.2
2017 56.5 67.8 45.2
2018 54.7 65.1 44.2
2019 54.2 64.8 43.6
2020 Unavailable Unavailable Unavailable
2021 Unavailable Unavailable Unavailable
2022 Unavailable Unavailable Unavailable
2023 Unavailable Unavailable Unavailable
2024 Unavailable Unavailable Unavailable
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.