Shell Rock Iowa Climate Data

Monthly Average Climate Data for Shell Rock Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-12.8 °C-3.2 °C25.15 mm
February-10.5 °C-0.8 °C28.19 mm
March-4.1 °C6.6 °C49.28 mm
April2.4 °C14.8 °C99.06 mm
May9.4 °C21.4 °C125.98 mm
June15.4 °C26.8 °C148.08 mm
July17.1 °C28.4 °C115.32 mm
August15.5 °C27.3 °C105.41 mm
September10.7 °C24 °C88.9 mm
October3.8 °C16.5 °C68.83 mm
November-3.1 °C7.4 °C46.48 mm
December-9.2 °C-0.1 °C37.34 mm
Annual2.9 °C14.1 °C938.02 mm

Climate Data for Shell Rock Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 5a : -28.9°C to -26.1°C
Plant Hardiness Zone - 2012Zone 5a : -28.9°C to -26.1°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2025 plantmaps.com