Marengo Illinois Climate Data

Monthly Average Climate Data for Marengo Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.2 °F29.1 °F1.73 in.
February16.2 °F33.4 °F1.7 in.
March26.0 °F45.2 °F2.24 in.
April36.7 °F58.4 °F3.74 in.
May47.8 °F70.3 °F4.73 in.
June57.8 °F79.8 °F5.11 in.
July62.1 °F83.5 °F3.98 in.
August60.3 °F81.6 °F4.07 in.
September52.1 °F75.2 °F3.59 in.
October40.5 °F62.1 °F2.8 in.
November29.7 °F47.0 °F2.38 in.
December19.2 °F34.4 °F1.98 in.
Annual38.5 °F58.3 °F38.05 in.

Climate Data for Marengo Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2024 plantmaps.com