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Pontiac city, Illinois

Official LSAD Designation: Pontiac city • Census GEOID: 1761015 • Livingston County

Climate Normals & Weather Observations

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

Reference Weather Station: PONTIAC, IL US (ID: USC00116910) • Located 0.9 miles from community center • Elevation: 198.1 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 32.4° 17.2° 24.8° 1.99"
February 37.0° 20.5° 28.8° 1.76"
March 49.3° 30.0° 39.6° 2.62"
April 62.8° 40.6° 51.7° 3.49"
May 73.6° 52.1° 62.8° 4.43"
June 82.0° 62.1° 72.0° 3.90"
July 84.3° 65.7° 75.0° 3.71"
August 83.0° 63.6° 73.3° 3.73"
September 78.1° 55.7° 66.9° 3.39"
October 65.3° 43.8° 54.6° 3.24"
November 50.2° 32.5° 41.3° 2.56"
December 37.8° 22.7° 30.3° 2.13"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station PONTIAC, IL US (ID: USC00116910) • 0.9 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 PONTIAC, 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 44.5 52.0 59.5 67.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 51.3°F 2011: Annual mean 51.8°F 2012: Annual mean 54.5°F 2013: Annual mean 49.9°F 2010: Annual mean of daily highs 61.1°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 59.4°F 2010: Annual mean of daily lows 41.4°F 2011: Annual mean of daily lows 42.9°F 2012: Annual mean of daily lows 44.6°F 2013: Annual mean of daily lows 40.4°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 51.3 61.1 41.4
2011 51.8 60.7 42.9
2012 54.5 64.5 44.6
2013 49.9 59.4 40.4
2014 Unavailable Unavailable Unavailable
2015 Unavailable Unavailable Unavailable
2016 Unavailable Unavailable Unavailable
2017 Unavailable Unavailable Unavailable
2018 Unavailable Unavailable Unavailable
2019 Unavailable Unavailable Unavailable
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.