Tennessee Illinois Climate Data

Monthly Average Climate Data for Tennessee Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.2 °F33.1 °F1.81 in.
February19.9 °F37.9 °F1.94 in.
March29.9 °F50.1 °F2.47 in.
April40.7 °F63.0 °F3.95 in.
May52.5 °F73.3 °F5.17 in.
June62.1 °F82.3 °F4.89 in.
July65.5 °F85.6 °F3.95 in.
August63.2 °F83.9 °F3.69 in.
September54.7 °F78.2 °F3.65 in.
October43.1 °F65.6 °F3.12 in.
November31.7 °F50.8 °F2.65 in.
December22.0 °F38.2 °F1.96 in.
Annual41.8 °F61.8 °F39.25 in.

Climate Data for Tennessee 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 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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