Swan Iowa Climate Data

Monthly Average Climate Data for Swan Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.5 °F31.1 °F0.99 in.
February17.1 °F35.7 °F1.32 in.
March28.3 °F48.6 °F2.05 in.
April40.0 °F62.3 °F3.84 in.
May52.1 °F71.8 °F5.12 in.
June62.3 °F81.7 °F5.25 in.
July66.0 °F85.3 °F4.33 in.
August63.5 °F84.0 °F4.21 in.
September54.8 °F77.2 °F3.57 in.
October42.4 °F63.8 °F2.6 in.
November29.9 °F49.0 °F1.76 in.
December19.1 °F36.1 °F1.3 in.
Annual40.8 °F60.6 °F36.34 in.

Climate Data for Swan Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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