Waterloo Illinois Climate Data

Monthly Average Climate Data for Waterloo Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.2 °F40.1 °F2.78 in.
February27.2 °F45.2 °F2.53 in.
March35.7 °F55.2 °F3.67 in.
April46.0 °F67.6 °F5.05 in.
May56.7 °F76.0 °F4.99 in.
June64.9 °F85.2 °F4.59 in.
July68.9 °F87.9 °F3.94 in.
August66.9 °F86.6 °F3.08 in.
September59.5 °F80.4 °F3.28 in.
October48.6 °F68.7 °F3.14 in.
November37.1 °F54.9 °F3.65 in.
December28.5 °F44.3 °F3.01 in.
Annual46.9 °F66 °F43.71 in.

Climate Data for Waterloo Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCfa - Humid Subtropical Climate
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