Donahue, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 15.3 °C (high). Annual precipitation averages 974.3 Millimeters. Donahue is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.3 °C | -1.3 °C | 36.32 mm |
| February | -8.4 °C | 1.1 °C | 44.7 mm |
| March | -2.3 °C | 8.4 °C | 63.5 mm |
| April | 3.9 °C | 15.9 °C | 97.28 mm |
| May | 10.5 °C | 22.1 °C | 123.19 mm |
| June | 16.1 °C | 27.2 °C | 124.97 mm |
| July | 18 °C | 28.8 °C | 108.71 mm |
| August | 16.8 °C | 27.8 °C | 104.9 mm |
| September | 12.2 °C | 24.8 °C | 91.69 mm |
| October | 5.6 °C | 17.4 °C | 73.41 mm |
| November | -1.1 °C | 9.1 °C | 56.64 mm |
| December | -6.9 °C | 1.7 °C | 49.02 mm |
| Annual | 4.5 °C | 15.3 °C | 974.33 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |