Whittemore, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.5 °C (low) to 13.5 °C (high). Annual precipitation averages 860.1 Millimeters. Whittemore is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.4 °C | -3.9 °C | 20.32 mm |
| February | -11 °C | -1.6 °C | 24.64 mm |
| March | -4.4 °C | 5.7 °C | 48.77 mm |
| April | 2.1 °C | 14.3 °C | 91.19 mm |
| May | 8.9 °C | 20.8 °C | 118.87 mm |
| June | 15.1 °C | 26.4 °C | 135.38 mm |
| July | 16.8 °C | 28.1 °C | 104.65 mm |
| August | 15.4 °C | 26.7 °C | 105.92 mm |
| September | 10.6 °C | 23.6 °C | 82.8 mm |
| October | 3.5 °C | 16.2 °C | 59.44 mm |
| November | -3.6 °C | 6.8 °C | 38.61 mm |
| December | -9.9 °C | -1.1 °C | 29.46 mm |
| Annual | 2.5 °C | 13.5 °C | 860.05 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |