Garrison Iowa Climate Data

Monthly Average Climate Data for Garrison Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January10.6 °F27.4 °F1.14 in.
February14.4 °F32.1 °F1.25 in.
March25.8 °F45.3 °F2.09 in.
April36.9 °F59.9 °F3.82 in.
May49.2 °F71.1 °F4.84 in.
June59.8 °F80.5 °F5.54 in.
July63.0 °F83.8 °F4.36 in.
August60.2 °F81.9 °F4.29 in.
September51.5 °F75.7 °F3.69 in.
October39.6 °F62.5 °F2.92 in.
November27.5 °F46.4 °F2.11 in.
December17.0 °F33.1 °F1.57 in.
Annual38 °F58.3 °F37.62 in.

Climate Data for Garrison Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation