Skip to main content

Quincy city, Illinois

Official LSAD Designation: Quincy city • Census GEOID: 1762367 • Adams County

Climate Normals & Weather Observations

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

Reference Weather Station: QUINCY DAM 21, IL US (ID: USC00117077) • Located 3.3 miles from community center • Elevation: 147.2 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 35.1° 18.9° 27.0° 1.66"
February 40.4° 22.7° 31.6° 1.91"
March 51.8° 32.0° 41.9° 2.48"
April 64.4° 42.9° 53.6° 4.22"
May 74.1° 54.2° 64.1° 4.80"
June 83.4° 63.9° 73.6° 4.12"
July 87.2° 67.6° 77.4° 3.64"
August 85.6° 65.7° 75.7° 3.33"
September 78.9° 57.1° 68.0° 3.37"
October 66.6° 45.4° 56.0° 2.65"
November 52.5° 33.8° 43.2° 2.57"
December 40.2° 24.5° 32.3° 1.73"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station QUINCY DAM 21, IL US (ID: USC00117077) • 3.3 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 QUINCY DAM 21, 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. 38.0 45.8 53.5 61.3 69.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 53.8°F 2018: Annual mean 54.0°F 2022: Annual mean 52.6°F 2010: Annual mean of daily highs 63.4°F 2018: Annual mean of daily highs 63.8°F 2022: Annual mean of daily highs 62.9°F 2023: Annual mean of daily highs 66.2°F 2010: Annual mean of daily lows 44.2°F 2014: Annual mean of daily lows 40.8°F 2016: Annual mean of daily lows 46.1°F 2018: Annual mean of daily lows 44.2°F 2022: Annual mean of daily lows 42.4°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 53.8 63.4 44.2
2011 Unavailable Unavailable Unavailable
2012 Unavailable Unavailable Unavailable
2013 Unavailable Unavailable Unavailable
2014 Unavailable Unavailable 40.8
2015 Unavailable Unavailable Unavailable
2016 Unavailable Unavailable 46.1
2017 Unavailable Unavailable Unavailable
2018 54.0 63.8 44.2
2019 Unavailable Unavailable Unavailable
2020 Unavailable Unavailable Unavailable
2021 Unavailable Unavailable Unavailable
2022 52.6 62.9 42.4
2023 Unavailable 66.2 Unavailable
2024 Unavailable Unavailable Unavailable
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.