Chelsea Iowa Climate Data

Monthly Average Climate Data for Chelsea Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January9.9 °F27.8 °F1.11 in.
February13.7 °F32.8 °F1.22 in.
March25.5 °F46.0 °F2.09 in.
April36.8 °F60.3 °F3.68 in.
May48.9 °F71.2 °F4.7 in.
June59.4 °F80.5 °F5.28 in.
July62.7 °F84.1 °F4.0 in.
August59.8 °F82.2 °F4.05 in.
September51.0 °F76.1 °F3.59 in.
October38.9 °F62.9 °F2.77 in.
November26.9 °F47.3 °F2.05 in.
December16.9 °F33.8 °F1.52 in.
Annual37.5 °F58.8 °F36.06 in.

Climate Data for Chelsea 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 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation