Treynor Iowa Climate Data

Monthly Average Climate Data for Treynor Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.3 °C-0.1 °C20.07 mm
February-8.2 °C2.6 °C25.4 mm
March-2.3 °C9.8 °C46.23 mm
April3.8 °C16.8 °C86.61 mm
May10.6 °C22.6 °C133.6 mm
June16.5 °C28 °C129.79 mm
July18.8 °C29.9 °C95.25 mm
August17.2 °C28.9 °C100.84 mm
September12.1 °C25.4 °C82.04 mm
October5.2 °C18.2 °C69.09 mm
November-1.8 °C9.4 °C39.12 mm
December-7.3 °C2.4 °C33.27 mm
Annual4.5 °C16.2 °C861.31 mm

Climate Data for Treynor Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5a : -28.9°C to -26.1°C
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2025 plantmaps.com