Clayton Illinois Climate Data

Monthly Average Climate Data for Clayton Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.3 °F34.0 °F1.86 in.
February20.9 °F39.1 °F1.93 in.
March30.5 °F50.7 °F2.52 in.
April41.4 °F62.9 °F4.02 in.
May52.8 °F73.0 °F5.17 in.
June62.2 °F82.0 °F4.83 in.
July65.6 °F85.7 °F4.06 in.
August63.2 °F84.1 °F3.7 in.
September54.6 °F78.2 °F3.47 in.
October43.3 °F65.6 °F3.24 in.
November32.3 °F51.5 °F2.68 in.
December22.6 °F38.9 °F2.08 in.
Annual42.2 °F62.1 °F39.56 in.

Climate Data for Clayton 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 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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