Stonington Illinois Climate Data

Monthly Average Climate Data for Stonington Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January19.1 °F35.5 °F2.22 in.
February22.3 °F40.5 °F2.02 in.
March31.5 °F51.7 °F2.8 in.
April42.1 °F64.7 °F4.29 in.
May53.4 °F74.9 °F4.66 in.
June62.4 °F83.3 °F4.68 in.
July65.3 °F86.3 °F3.79 in.
August63.2 °F84.9 °F3.36 in.
September55.0 °F80.0 °F3.22 in.
October43.6 °F67.6 °F3.3 in.
November33.1 °F52.2 °F3.23 in.
December24.6 °F40.4 °F2.35 in.
Annual43 °F63.5 °F39.92 in.

Climate Data for Stonington Illinois

Average First Frost DateOct. 11 - Oct. 20
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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