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Sumner city, Iowa

Official LSAD Designation: Sumner city • Census GEOID: 1976260 • Bremer County / Fayette County

Climate Normals & Weather Observations

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

Reference Weather Station: TRIPOLI, IA US (ID: USC00138339) • Located 8.5 miles from community center • Elevation: 321.6 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 24.8° 7.3° 16.1° 1.23"
February 29.2° 11.5° 20.3° 1.09"
March 42.8° 24.0° 33.4° 2.00"
April 57.6° 35.6° 46.6° 3.93"
May 70.0° 47.9° 58.9° 5.11"
June 79.6° 58.6° 69.1° 6.03"
July 82.8° 61.6° 72.2° 4.80"
August 80.9° 59.0° 69.9° 4.29"
September 74.5° 50.3° 62.4° 3.75"
October 61.0° 38.2° 49.6° 2.96"
November 44.3° 25.6° 35.0° 1.98"
December 30.9° 14.6° 22.7° 1.47"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station TRIPOLI, IA US (ID: USC00138339) • 8.5 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 TRIPOLI, 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. 28.0 37.3 46.5 55.8 65.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2011: Annual mean 46.4°F 2012: Annual mean 50.0°F 2013: Annual mean 44.3°F 2014: Annual mean 42.1°F 2016: Annual mean 48.9°F 2017: Annual mean 48.3°F 2018: Annual mean 45.9°F 2019: Annual mean 45.2°F 2020: Annual mean 47.4°F 2011: Annual mean of daily highs 56.5°F 2012: Annual mean of daily highs 61.4°F 2013: Annual mean of daily highs 54.4°F 2014: Annual mean of daily highs 52.4°F 2016: Annual mean of daily highs 58.7°F 2017: Annual mean of daily highs 58.4°F 2018: Annual mean of daily highs 55.4°F 2019: Annual mean of daily highs 55.0°F 2020: Annual mean of daily highs 58.0°F 2011: Annual mean of daily lows 36.3°F 2012: Annual mean of daily lows 38.6°F 2013: Annual mean of daily lows 34.2°F 2014: Annual mean of daily lows 31.8°F 2016: Annual mean of daily lows 39.1°F 2017: Annual mean of daily lows 38.2°F 2018: Annual mean of daily lows 36.4°F 2019: Annual mean of daily lows 35.3°F 2020: Annual mean of daily lows 36.7°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 46.4 56.5 36.3
2012 50.0 61.4 38.6
2013 44.3 54.4 34.2
2014 42.1 52.4 31.8
2015 Unavailable Unavailable Unavailable
2016 48.9 58.7 39.1
2017 48.3 58.4 38.2
2018 45.9 55.4 36.4
2019 45.2 55.0 35.3
2020 47.4 58.0 36.7
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.