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Nason city, Illinois

Official LSAD Designation: Nason city • Census GEOID: 1751726 • Jefferson County

Climate Normals & Weather Observations

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

Reference Weather Station: REND LAKE DAM, IL US (ID: USC00117187) • Located 9.4 miles from community center • Elevation: 138.7 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 39.5° 21.9° 30.7° 3.18"
February 43.7° 24.7° 34.2° 2.80"
March 55.4° 34.6° 45.0° 4.21"
April 67.7° 45.4° 56.6° 5.43"
May 76.4° 56.0° 66.2° 5.07"
June 85.8° 65.1° 75.5° 4.48"
July 88.1° 68.4° 78.3° 3.96"
August 86.9° 66.4° 76.7° 3.35"
September 80.6° 57.8° 69.2° 3.22"
October 69.3° 46.1° 57.7° 3.44"
November 55.3° 35.4° 45.4° 3.97"
December 44.2° 26.5° 35.4° 2.89"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station REND LAKE DAM, IL US (ID: USC00117187) • 9.4 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 REND LAKE DAM, 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. 44.0 50.3 56.5 62.8 69.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2018: Annual mean 55.5°F 2020: Annual mean 56.4°F 2021: Annual mean 57.0°F 2018: Annual mean of daily highs 64.9°F 2020: Annual mean of daily highs 65.6°F 2021: Annual mean of daily highs 66.9°F 2018: Annual mean of daily lows 46.1°F 2020: Annual mean of daily lows 47.2°F 2021: Annual mean of daily lows 47.0°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 Unavailable Unavailable Unavailable
2016 Unavailable Unavailable Unavailable
2017 Unavailable Unavailable Unavailable
2018 55.5 64.9 46.1
2019 Unavailable Unavailable Unavailable
2020 56.4 65.6 47.2
2021 57.0 66.9 47.0
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.