Jefferson Iowa Climate Data

Monthly Average Climate Data for Jefferson Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-12 °C-2.1 °C23.11 mm
February-9.6 °C0.6 °C30.23 mm
March-3.4 °C8 °C50.55 mm
April2.8 °C16.1 °C95.76 mm
May9.7 °C21.9 °C125.48 mm
June15.4 °C27.2 °C132.33 mm
July17.5 °C29.1 °C106.93 mm
August16 °C27.9 °C101.85 mm
September10.9 °C24.7 °C80.52 mm
October4.2 °C17.5 °C64.52 mm
November-2.7 °C8.3 °C45.21 mm
December-8.6 °C0.9 °C33.53 mm
Annual3.4 °C15 °C890.02 mm

Climate Data for Jefferson Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5a : -28.9°C to -26.1°C
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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