Sumner Illinois Climate Data

Monthly Average Climate Data for Sumner Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January22.5 °F38.7 °F3.43 in.
February25.5 °F43.7 °F2.64 in.
March33.8 °F54.1 °F3.84 in.
April44.2 °F66.3 °F5.05 in.
May55.3 °F76.1 °F5.21 in.
June64.0 °F84.8 °F4.95 in.
July66.6 °F87.4 °F4.44 in.
August64.3 °F86.5 °F3.08 in.
September56.5 °F81.3 °F3.47 in.
October44.9 °F69.2 °F3.69 in.
November34.7 °F54.8 °F4.0 in.
December26.8 °F43.1 °F3.41 in.
Annual44.9 °F65.5 °F47.21 in.

Climate Data for Sumner 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 6b : -5°F to 0°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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