Riverside Illinois Climate Data

Monthly Average Climate Data for Riverside Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.0 °F31.8 °F2.17 in.
February20.8 °F35.6 °F2.08 in.
March29.9 °F46.5 °F2.36 in.
April40.2 °F59.1 °F3.97 in.
May51.2 °F70.3 °F4.75 in.
June61.4 °F80.3 °F4.36 in.
July66.6 °F84.8 °F4.23 in.
August65.2 °F82.7 °F4.14 in.
September57.4 °F76.3 °F3.25 in.
October45.0 °F63.3 °F3.44 in.
November33.7 °F49.0 °F2.54 in.
December23.7 °F37.1 °F2.32 in.
Annual42.8 °F59.7 °F39.61 in.

Climate Data for Riverside 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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