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Temperature & Rainfall Trends

Note: Trends are based on data recorded at Grinnell since 2010.

Annual Temperature Trend
Month Average since 2010 Current Month Difference
January 21.8°F 22.3°F (2024) 0.5°F0.5°F Warmer than All-Time Average Temperature.
February 24.7°F 37.8°F (2024) 13.1°F13.1°F Warmer than All-Time Average Temperature.
March 38.3°F 42.8°F (2024) 4.5°F4.5°F Warmer than All-Time Average Temperature.
April 49.6°F 52.4°F (2024) 2.8°F2.8°F Warmer than All-Time Average Temperature.
May 61.8°F 63.5°F (2024) 1.7°F1.7°F Warmer than All-Time Average Temperature.
June 68.5°F 73.1°F (2024) 4.6°F4.6°F Warmer than All-Time Average Temperature.
July 74.6°F 71.9°F (2024) -2.7°F2.7°F Colder than All-Time Average Temperature.
August 71.9°F 71.5°F (2024) -0.4°F0.4°F Colder than All-Time Average Temperature.
September 65.8°F 67.4°F (2024) 1.6°F1.6°F Warmer than All-Time Average Temperature.
October 52.1°F 60.8°F (2024) 8.7°F8.7°F Warmer than All-Time Average Temperature.
November 38.3°F 41.0°F (2023) 2.7°F2.7°F Warmer than All-Time Average Temperature.
December 28.2°F 36.3°F (2023) 8.1°F8.1°F Warmer than All-Time Average Temperature.
Average 12 Month Temperature since 2010: 49.7°F
Current 12 Month Temperature: 52.8°F
Current 12 Month Temperature Trend: 3.1°F3.1°F Warmer than All-Time Average Temperature.

Annual Rainfall Trend
Month Average since 2010 Current Month Difference
January 0.46 in 0.80 in (2024) 0.34 in0.34 in more than All-Time Average Rainfall.
February 0.38 in 0.21 in (2024) -0.17 in0.17 in less than All-Time Average Rainfall.
March 1.47 in 0.86 in (2024) -0.61 in0.61 in Colder than All-Time Average Temperature.
April 2.31 in 3.31 in (2024) 1.00 in1 in more than All-Time Average Rainfall.
May 3.88 in 9.46 in (2024) 5.58 in5.58 in more than All-Time Average Rainfall.
June 4.20 in 4.81 in (2024) 0.61 in0.61 in more than All-Time Average Rainfall.
July 2.91 in 7.70 in (2024) 4.79 in4.79 in more than All-Time Average Rainfall.
August 2.76 in 3.48 in (2024) 0.72 in0.72 in more than All-Time Average Rainfall.
September 3.00 in 0.35 in (2024) -2.65 in2.65 in less than All-Time Average Rainfall.
October 2.83 in 0.12 in (2024) -2.71 in2.71 in less than All-Time Average Rainfall.
November 1.43 in 0.30 in (2023) -1.13 in1.13 in less than All-Time Average Rainfall.
December 1.02 in 1.88 in (2023) 0.86 in0.86 in more than All-Time Average Rainfall.
Average 12 Month Rainfall since 2010: 26.65 in
Rainfall for last 12 months: 36.43 in
Current 12 Month Rainfall difference: 9.78 in9.78 in more than All-Time Average Rainfall.
This data is reflective of 12 month trending at the Grinnell Weather Station location. This is not official scientific data. The weather data presented here is based on data collected since 2010. Script courtesy of  Michael Holden from Relay Weather. Script calculations courtesy of Murry Conarroe of Wildwood Weather.