Royalton Illinois Climate Data

Monthly Average Climate Data for Royalton Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January24.0 °F40.8 °F3.24 in.
February27.4 °F45.8 °F3.03 in.
March35.6 °F55.9 °F4.22 in.
April45.8 °F67.4 °F5.3 in.
May56.2 °F76.5 °F5.3 in.
June64.8 °F85.2 °F4.64 in.
July68.3 °F88.1 °F3.86 in.
August65.6 °F87.0 °F3.09 in.
September57.3 °F81.2 °F3.28 in.
October45.6 °F69.9 °F3.54 in.
November35.8 °F56.2 °F4.14 in.
December28.1 °F45.0 °F3.48 in.
Annual46.2 °F66.6 °F47.12 in.

Climate Data for Royalton Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 11 - Apr. 20
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 ConditionsNormal
Köppen Climate ClassificationCfa - Humid Subtropical Climate
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