Riverdale Illinois Climate Data

Monthly Average Climate Data for Riverdale Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.2 °F32.4 °F2.21 in.
February20.9 °F36.0 °F2.09 in.
March29.9 °F46.4 °F2.38 in.
April40.1 °F59.1 °F3.86 in.
May51.0 °F70.0 °F4.47 in.
June61.1 °F80.0 °F4.52 in.
July66.2 °F84.1 °F4.38 in.
August64.6 °F82.3 °F4.16 in.
September57.0 °F76.2 °F3.25 in.
October44.9 °F63.4 °F3.49 in.
November33.9 °F49.4 °F2.7 in.
December23.8 °F37.6 °F2.29 in.
Annual42.6 °F59.7 °F39.8 in.

Climate Data for Riverdale Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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