Seymour Illinois Climate Data

Monthly Average Climate Data for Seymour Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.7 °F33.7 °F2.27 in.
February20.7 °F38.0 °F1.99 in.
March29.9 °F49.8 °F2.74 in.
April40.4 °F63.3 °F4.08 in.
May52.4 °F73.8 °F4.51 in.
June61.1 °F82.2 °F4.65 in.
July64.1 °F84.2 °F4.11 in.
August61.5 °F82.7 °F3.21 in.
September54.3 °F78.7 °F3.17 in.
October42.5 °F65.7 °F3.43 in.
November31.8 °F51.0 °F3.08 in.
December23.4 °F38.5 °F2.41 in.
Annual41.7 °F61.8 °F39.65 in.

Climate Data for Seymour 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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