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Derby city, Iowa

Official LSAD Designation: Derby city • Census GEOID: 1920125 • Lucas County

Climate Normals & Weather Observations

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

Reference Weather Station: CHARITON 1 E, IA US (ID: USC00131394) • Located 11.0 miles from community center • Elevation: 294.1 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 31.0° 10.6° 20.8° 0.96"
February 35.7° 13.7° 24.7° 1.40"
March 48.5° 24.7° 36.6° 1.90"
April 61.0° 35.0° 48.0° 4.15"
May 70.7° 46.6° 58.7° 5.39"
June 80.3° 57.1° 68.7° 4.92"
July 84.5° 61.5° 73.0° 4.21"
August 83.1° 59.0° 71.1° 4.40"
September 76.1° 49.8° 62.9° 3.71"
October 63.8° 37.8° 50.8° 2.98"
November 48.6° 26.1° 37.4° 2.03"
December 36.5° 16.2° 26.4° 1.27"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station CHARITON 1 E, IA US (ID: USC00131394) • 11.0 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 CHARITON 1 E, 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. 33.0 41.3 49.5 57.8 66.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2011: Annual mean 49.1°F 2015: Annual mean 49.5°F 2017: Annual mean 50.4°F 2019: Annual mean 47.4°F 2020: Annual mean 49.6°F 2021: Annual mean 50.1°F 2022: Annual mean 48.4°F 2023: Annual mean 51.1°F 2011: Annual mean of daily highs 60.5°F 2015: Annual mean of daily highs 61.0°F 2017: Annual mean of daily highs 62.8°F 2019: Annual mean of daily highs 58.6°F 2020: Annual mean of daily highs 61.1°F 2021: Annual mean of daily highs 61.1°F 2022: Annual mean of daily highs 60.3°F 2023: Annual mean of daily highs 63.2°F 2025: Annual mean of daily highs 61.5°F 2011: Annual mean of daily lows 37.7°F 2015: Annual mean of daily lows 38.0°F 2017: Annual mean of daily lows 38.0°F 2019: Annual mean of daily lows 36.3°F 2020: Annual mean of daily lows 38.1°F 2021: Annual mean of daily lows 39.2°F 2022: Annual mean of daily lows 36.6°F 2023: Annual mean of daily lows 38.9°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 49.1 60.5 37.7
2012 Unavailable Unavailable Unavailable
2013 Unavailable Unavailable Unavailable
2014 Unavailable Unavailable Unavailable
2015 49.5 61.0 38.0
2016 Unavailable Unavailable Unavailable
2017 50.4 62.8 38.0
2018 Unavailable Unavailable Unavailable
2019 47.4 58.6 36.3
2020 49.6 61.1 38.1
2021 50.1 61.1 39.2
2022 48.4 60.3 36.6
2023 51.1 63.2 38.9
2024 Unavailable Unavailable Unavailable
2025 Unavailable 61.5 Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.