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Jacksonville city, Illinois

Official LSAD Designation: Jacksonville city • Census GEOID: 1738115 • Morgan County

Climate Normals & Weather Observations

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

Reference Weather Station: JACKSONVILLE 2, IL US (ID: USC00114447) • Located 1.1 miles from community center • Elevation: 190.8 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 35.3° 17.6° 26.4° 2.21"
February 40.5° 20.9° 30.7° 2.02"
March 52.1° 30.3° 41.2° 3.04"
April 65.0° 40.5° 52.7° 4.46"
May 75.0° 52.6° 63.8° 5.09"
June 83.4° 61.9° 72.7° 4.96"
July 86.9° 65.4° 76.1° 3.97"
August 85.7° 63.2° 74.5° 3.32"
September 79.9° 54.7° 67.3° 3.78"
October 67.0° 42.9° 54.9° 3.11"
November 52.3° 31.8° 42.0° 3.08"
December 39.9° 22.9° 31.4° 2.35"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station JACKSONVILLE 2, IL US (ID: USC00114447) • 1.1 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 JACKSONVILLE 2, 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. 36.0 45.0 54.0 63.0 72.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2012: Annual mean 56.8°F 2013: Annual mean 51.7°F 2014: Annual mean 49.8°F 2015: Annual mean 53.3°F 2016: Annual mean 55.1°F 2017: Annual mean 55.0°F 2018: Annual mean 53.0°F 2022: Annual mean 51.8°F 2024: Annual mean 55.9°F 2025: Annual mean 54.2°F 2012: Annual mean of daily highs 68.5°F 2013: Annual mean of daily highs 62.3°F 2014: Annual mean of daily highs 60.5°F 2015: Annual mean of daily highs 64.0°F 2016: Annual mean of daily highs 65.6°F 2017: Annual mean of daily highs 66.4°F 2018: Annual mean of daily highs 63.8°F 2022: Annual mean of daily highs 62.8°F 2024: Annual mean of daily highs 66.9°F 2025: Annual mean of daily highs 65.2°F 2012: Annual mean of daily lows 45.2°F 2013: Annual mean of daily lows 41.1°F 2014: Annual mean of daily lows 39.1°F 2015: Annual mean of daily lows 42.5°F 2016: Annual mean of daily lows 44.5°F 2017: Annual mean of daily lows 43.6°F 2018: Annual mean of daily lows 42.1°F 2021: Annual mean of daily lows 43.6°F 2022: Annual mean of daily lows 40.9°F 2024: Annual mean of daily lows 44.8°F 2025: Annual mean of daily lows 43.3°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 56.8 68.5 45.2
2013 51.7 62.3 41.1
2014 49.8 60.5 39.1
2015 53.3 64.0 42.5
2016 55.1 65.6 44.5
2017 55.0 66.4 43.6
2018 53.0 63.8 42.1
2019 Unavailable Unavailable Unavailable
2020 Unavailable Unavailable Unavailable
2021 Unavailable Unavailable 43.6
2022 51.8 62.8 40.9
2023 Unavailable Unavailable Unavailable
2024 55.9 66.9 44.8
2025 54.2 65.2 43.3
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.