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Jefferson city, Iowa

Official LSAD Designation: Jefferson city • Census GEOID: 1939450 • Greene County

Climate Normals & Weather Observations

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

Reference Weather Station: JEFFERSON, IA US (ID: USC00134228) • Located 1.0 miles from community center • Elevation: 321.6 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 27.6° 9.1° 18.4° 0.96"
February 32.5° 13.3° 22.9° 1.28"
March 46.1° 25.2° 35.6° 1.96"
April 60.2° 36.0° 48.1° 3.58"
May 71.1° 48.7° 59.9° 4.97"
June 80.5° 59.3° 69.9° 5.19"
July 83.4° 62.8° 73.1° 4.38"
August 81.3° 60.4° 70.9° 4.21"
September 75.8° 51.1° 63.5° 3.13"
October 62.9° 39.1° 51.0° 2.58"
November 46.4° 25.7° 36.1° 1.69"
December 32.9° 15.5° 24.2° 1.38"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station JEFFERSON, IA US (ID: USC00134228) • 1.0 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 JEFFERSON, IA 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) 2010: Annual mean 47.3°F 2011: Annual mean 47.7°F 2012: Annual mean 51.6°F 2013: Annual mean 46.2°F 2015: Annual mean 48.8°F 2020: Annual mean 48.9°F 2021: Annual mean 49.9°F 2022: Annual mean 47.0°F 2023: Annual mean 49.9°F 2010: Annual mean of daily highs 57.6°F 2011: Annual mean of daily highs 58.4°F 2012: Annual mean of daily highs 64.0°F 2013: Annual mean of daily highs 56.8°F 2015: Annual mean of daily highs 59.2°F 2020: Annual mean of daily highs 59.6°F 2021: Annual mean of daily highs 60.4°F 2022: Annual mean of daily highs 58.6°F 2023: Annual mean of daily highs 60.8°F 2010: Annual mean of daily lows 37.0°F 2011: Annual mean of daily lows 36.9°F 2012: Annual mean of daily lows 39.2°F 2013: Annual mean of daily lows 35.6°F 2015: Annual mean of daily lows 38.4°F 2020: Annual mean of daily lows 38.2°F 2021: Annual mean of daily lows 39.4°F 2022: Annual mean of daily lows 35.5°F 2023: Annual mean of daily lows 39.0°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 47.3 57.6 37.0
2011 47.7 58.4 36.9
2012 51.6 64.0 39.2
2013 46.2 56.8 35.6
2014 Unavailable Unavailable Unavailable
2015 48.8 59.2 38.4
2016 Unavailable Unavailable Unavailable
2017 Unavailable Unavailable Unavailable
2018 Unavailable Unavailable Unavailable
2019 Unavailable Unavailable Unavailable
2020 48.9 59.6 38.2
2021 49.9 60.4 39.4
2022 47.0 58.6 35.5
2023 49.9 60.8 39.0
2024 Unavailable Unavailable Unavailable
2025 Unavailable Unavailable Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.