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Illinois City CDP, Illinois

Official LSAD Designation: Illinois City CDP • Census GEOID: 1737062 • Rock Island County

Climate Normals & Weather Observations

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

Reference Weather Station: ILLINOIS CITY DAM 16, IL US (ID: USC00114355) • Located 6.0 miles from community center • Elevation: 167.6 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 30.7° 13.3° 22.0° 1.18"
February 35.3° 17.4° 26.4° 1.55"
March 48.1° 29.5° 38.8° 2.29"
April 61.2° 39.0° 50.1° 3.47"
May 72.2° 51.2° 61.7° 4.82"
June 81.3° 61.5° 71.4° 5.00"
July 84.9° 64.8° 74.9° 4.03"
August 83.2° 62.8° 73.0° 3.94"
September 76.5° 54.9° 65.7° 3.57"
October 63.9° 43.2° 53.6° 2.78"
November 48.6° 30.6° 39.6° 2.13"
December 36.3° 20.0° 28.1° 1.68"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station ILLINOIS CITY DAM 16, IL US (ID: USC00114355) • 6.0 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 ILLINOIS CITY DAM 16, 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. 34.0 42.5 51.0 59.5 68.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2012: Annual mean 54.0°F 2013: Annual mean 49.2°F 2015: Annual mean 50.8°F 2016: Annual mean 52.8°F 2017: Annual mean 52.0°F 2018: Annual mean 49.8°F 2020: Annual mean 51.5°F 2021: Annual mean 52.4°F 2022: Annual mean 50.2°F 2023: Annual mean 52.4°F 2024: Annual mean 53.3°F 2025: Annual mean 51.4°F 2011: Annual mean of daily highs 60.7°F 2012: Annual mean of daily highs 64.5°F 2013: Annual mean of daily highs 59.1°F 2015: Annual mean of daily highs 60.8°F 2016: Annual mean of daily highs 62.2°F 2017: Annual mean of daily highs 62.1°F 2018: Annual mean of daily highs 59.6°F 2020: Annual mean of daily highs 60.9°F 2021: Annual mean of daily highs 61.4°F 2022: Annual mean of daily highs 60.0°F 2023: Annual mean of daily highs 62.6°F 2024: Annual mean of daily highs 63.5°F 2025: Annual mean of daily highs 61.7°F 2012: Annual mean of daily lows 43.5°F 2013: Annual mean of daily lows 39.3°F 2014: Annual mean of daily lows 37.1°F 2015: Annual mean of daily lows 40.8°F 2016: Annual mean of daily lows 43.4°F 2017: Annual mean of daily lows 41.8°F 2018: Annual mean of daily lows 40.0°F 2019: Annual mean of daily lows 40.4°F 2020: Annual mean of daily lows 42.2°F 2021: Annual mean of daily lows 43.3°F 2022: Annual mean of daily lows 40.4°F 2023: Annual mean of daily lows 42.3°F 2024: Annual mean of daily lows 43.2°F 2025: Annual mean of daily lows 41.0°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 60.7 Unavailable
2012 54.0 64.5 43.5
2013 49.2 59.1 39.3
2014 Unavailable Unavailable 37.1
2015 50.8 60.8 40.8
2016 52.8 62.2 43.4
2017 52.0 62.1 41.8
2018 49.8 59.6 40.0
2019 Unavailable Unavailable 40.4
2020 51.5 60.9 42.2
2021 52.4 61.4 43.3
2022 50.2 60.0 40.4
2023 52.4 62.6 42.3
2024 53.3 63.5 43.2
2025 51.4 61.7 41.0
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.