Marengo Iowa Climate Data

Monthly Average Climate Data for Marengo Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.1 °F29.0 °F1.14 in.
February15.8 °F33.8 °F1.33 in.
March27.0 °F46.9 °F2.14 in.
April38.0 °F60.9 °F3.68 in.
May50.3 °F72.0 °F4.77 in.
June60.6 °F81.3 °F5.2 in.
July64.0 °F84.7 °F4.26 in.
August61.4 °F82.9 °F4.3 in.
September52.6 °F76.7 °F3.58 in.
October40.5 °F63.6 °F2.85 in.
November28.6 °F47.8 °F2.12 in.
December18.2 °F34.5 °F1.6 in.
Annual39.1 °F59.5 °F36.97 in.

Climate Data for Marengo 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 5b : -15°F to -10°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