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Grinnell city, Iowa

Official LSAD Designation: Grinnell city • Census GEOID: 1933105 • Poweshiek County

Climate Normals & Weather Observations

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

Reference Weather Station: GRINNELL 3 SW, IA US (ID: USC00133473) • Located 1.6 miles from community center • Elevation: 275.8 m
Month Average High (°F) Average Low (°F) Mean Temp (°F) Precipitation (in)
January 28.3° 10.2° 19.3° 1.10"
February 33.0° 13.6° 23.3° 1.55"
March 46.1° 24.7° 35.4° 2.22"
April 59.4° 35.1° 47.3° 3.90"
May 69.9° 47.1° 58.5° 5.09"
June 79.5° 57.8° 68.6° 5.53"
July 83.3° 61.8° 72.5° 3.96"
August 81.2° 59.2° 70.2° 4.37"
September 75.2° 50.2° 62.7° 3.71"
October 62.3° 38.2° 50.2° 3.21"
November 46.8° 26.4° 36.6° 1.95"
December 34.0° 16.3° 25.2° 1.60"

Annual Temperature History

2010–2025, completed calendar years only.

NOAA station GRINNELL 3 SW, IA US (ID: USC00133473) • 1.6 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 GRINNELL 3 SW, 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. 31.0 39.8 48.5 57.3 66.0 2010 2014 2018 2021 2025 Year Annual mean temperature (°F) 2010: Annual mean 47.5°F 2011: Annual mean 47.9°F 2012: Annual mean 50.8°F 2013: Annual mean 45.8°F 2014: Annual mean 44.5°F 2015: Annual mean 48.1°F 2016: Annual mean 49.8°F 2017: Annual mean 49.0°F 2018: Annual mean 47.1°F 2023: Annual mean 50.5°F 2024: Annual mean 51.4°F 2010: Annual mean of daily highs 58.3°F 2011: Annual mean of daily highs 58.7°F 2012: Annual mean of daily highs 63.1°F 2013: Annual mean of daily highs 56.5°F 2014: Annual mean of daily highs 55.0°F 2015: Annual mean of daily highs 58.7°F 2016: Annual mean of daily highs 59.9°F 2017: Annual mean of daily highs 60.1°F 2018: Annual mean of daily highs 57.1°F 2023: Annual mean of daily highs 62.2°F 2024: Annual mean of daily highs 62.8°F 2025: Annual mean of daily highs 61.5°F 2010: Annual mean of daily lows 36.8°F 2011: Annual mean of daily lows 37.0°F 2012: Annual mean of daily lows 38.5°F 2013: Annual mean of daily lows 35.2°F 2014: Annual mean of daily lows 34.0°F 2015: Annual mean of daily lows 37.5°F 2016: Annual mean of daily lows 39.7°F 2017: Annual mean of daily lows 37.9°F 2018: Annual mean of daily lows 37.2°F 2023: Annual mean of daily lows 38.8°F 2024: Annual mean of daily lows 40.0°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 47.5 58.3 36.8
2011 47.9 58.7 37.0
2012 50.8 63.1 38.5
2013 45.8 56.5 35.2
2014 44.5 55.0 34.0
2015 48.1 58.7 37.5
2016 49.8 59.9 39.7
2017 49.0 60.1 37.9
2018 47.1 57.1 37.2
2019 Unavailable Unavailable Unavailable
2020 Unavailable Unavailable Unavailable
2021 Unavailable Unavailable Unavailable
2022 Unavailable Unavailable Unavailable
2023 50.5 62.2 38.8
2024 51.4 62.8 40.0
2025 Unavailable 61.5 Unavailable
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.