Grimes Iowa Climate Data

Monthly Average Climate Data for Grimes Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.0 °F29.5 °F1.0 in.
February15.9 °F34.1 °F1.26 in.
March27.2 °F47.2 °F2.12 in.
April38.5 °F61.3 °F3.73 in.
May50.5 °F71.5 °F4.9 in.
June60.9 °F81.1 °F5.24 in.
July64.7 °F85.0 °F4.23 in.
August62.1 °F83.1 °F4.14 in.
September53.4 °F77.0 °F3.45 in.
October41.0 °F63.6 °F2.6 in.
November28.7 °F48.2 °F1.86 in.
December17.9 °F34.8 °F1.46 in.
Annual39.4 °F59.7 °F35.99 in.

Climate Data for Grimes Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation