Thornburg Iowa Climate Data

Monthly Average Climate Data for Thornburg Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.5 °F29.6 °F1.16 in.
February16.1 °F34.3 °F1.44 in.
March27.0 °F47.4 °F2.18 in.
April38.0 °F60.7 °F3.79 in.
May50.3 °F71.2 °F4.99 in.
June60.8 °F80.9 °F5.33 in.
July64.4 °F84.5 °F4.23 in.
August61.5 °F82.6 °F4.38 in.
September52.5 °F76.2 °F3.58 in.
October40.7 °F63.4 °F2.81 in.
November28.8 °F47.9 °F2.15 in.
December18.6 °F35.1 °F1.55 in.
Annual39.3 °F59.5 °F37.59 in.

Climate Data for Thornburg Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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