Knoxville Iowa Climate Data

Monthly Average Climate Data for Knoxville Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.4 °F30.8 °F0.97 in.
February17.4 °F35.5 °F1.5 in.
March28.1 °F48.4 °F1.97 in.
April39.2 °F61.4 °F4.14 in.
May51.3 °F71.5 °F5.2 in.
June61.6 °F81.3 °F5.38 in.
July65.4 °F85.1 °F4.68 in.
August62.7 °F83.2 °F4.25 in.
September53.9 °F76.6 °F3.73 in.
October41.9 °F63.8 °F2.42 in.
November29.7 °F48.5 °F1.81 in.
December19.3 °F36.0 °F1.45 in.
Annual40.3 °F60.2 °F37.5 in.

Climate Data for Knoxville Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°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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