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Naperville city, Illinois

Official LSAD Designation: Naperville city • Census GEOID: 1751622 • DuPage County / Will County

Climate Normals & Weather Observations

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

Reference Weather Station: LISLE-MORTON ARBORETUM, IL US (ID: USC00115097) • Located 6.4 miles from community center • Elevation: 207.3 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 31.5° 14.7° 23.1° 2.19"
February 35.2° 17.7° 26.4° 1.96"
March 47.2° 26.1° 36.7° 2.36"
April 59.2° 36.1° 47.7° 3.82"
May 70.6° 47.4° 59.0° 4.79"
June 80.7° 57.9° 69.3° 4.43"
July 84.4° 61.8° 73.1° 4.25"
August 82.7° 60.2° 71.4° 4.35"
September 76.0° 52.3° 64.2° 3.36"
October 62.6° 40.4° 51.5° 3.58"
November 48.4° 29.9° 39.2° 2.77"
December 36.6° 20.6° 28.6° 2.32"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station LISLE-MORTON ARBORETUM, IL US (ID: USC00115097) • 6.4 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 LISLE-MORTON ARBORETUM, 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. 32.0 40.8 49.5 58.3 67.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2011: Annual mean 49.6°F 2012: Annual mean 52.4°F 2016: Annual mean 51.3°F 2017: Annual mean 50.5°F 2018: Annual mean 49.0°F 2019: Annual mean 48.5°F 2021: Annual mean 50.8°F 2023: Annual mean 50.0°F 2024: Annual mean 51.9°F 2010: Annual mean of daily highs 60.9°F 2011: Annual mean of daily highs 59.7°F 2012: Annual mean of daily highs 64.0°F 2016: Annual mean of daily highs 61.3°F 2017: Annual mean of daily highs 61.1°F 2018: Annual mean of daily highs 59.1°F 2019: Annual mean of daily highs 58.3°F 2021: Annual mean of daily highs 61.1°F 2022: Annual mean of daily highs 59.1°F 2023: Annual mean of daily highs 60.4°F 2024: Annual mean of daily highs 62.2°F 2011: Annual mean of daily lows 39.4°F 2012: Annual mean of daily lows 40.7°F 2014: Annual mean of daily lows 35.4°F 2016: Annual mean of daily lows 41.3°F 2017: Annual mean of daily lows 40.0°F 2018: Annual mean of daily lows 38.9°F 2019: Annual mean of daily lows 38.8°F 2021: Annual mean of daily lows 40.5°F 2023: Annual mean of daily lows 39.6°F 2024: Annual mean of daily lows 41.5°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 60.9 Unavailable
2011 49.6 59.7 39.4
2012 52.4 64.0 40.7
2013 Unavailable Unavailable Unavailable
2014 Unavailable Unavailable 35.4
2015 Unavailable Unavailable Unavailable
2016 51.3 61.3 41.3
2017 50.5 61.1 40.0
2018 49.0 59.1 38.9
2019 48.5 58.3 38.8
2020 Unavailable Unavailable Unavailable
2021 50.8 61.1 40.5
2022 Unavailable 59.1 Unavailable
2023 50.0 60.4 39.6
2024 51.9 62.2 41.5
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.