Keystone Iowa Climate Data

Monthly Average Climate Data for Keystone Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January10.9 °F27.6 °F1.12 in.
February14.6 °F32.4 °F1.25 in.
March25.8 °F45.6 °F2.1 in.
April36.9 °F59.8 °F3.75 in.
May49.3 °F71.0 °F4.74 in.
June59.9 °F80.5 °F5.41 in.
July63.2 °F83.8 °F4.17 in.
August60.4 °F81.9 °F4.17 in.
September51.6 °F75.6 °F3.65 in.
October39.7 °F62.5 °F2.83 in.
November27.6 °F46.6 °F2.09 in.
December17.2 °F33.4 °F1.55 in.
Annual38.1 °F58.4 °F36.83 in.

Climate Data for Keystone Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2024 plantmaps.com