Plymouth Iowa Climate Data

Monthly Average Climate Data for Plymouth Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.2 °F23.9 °F0.96 in.
February11.2 °F28.5 °F1.1 in.
March23.4 °F41.0 °F1.98 in.
April35.1 °F56.5 °F3.92 in.
May47.4 °F68.6 °F5.22 in.
June58.0 °F78.7 °F5.5 in.
July61.6 °F81.8 °F4.62 in.
August58.9 °F79.5 °F3.96 in.
September50.2 °F73.4 °F3.41 in.
October37.7 °F59.9 °F2.61 in.
November25.4 °F43.4 °F1.74 in.
December14.2 °F29.7 °F1.33 in.
Annual35.9 °F55.4 °F36.35 in.

Climate Data for Plymouth Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 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
2024 plantmaps.com