Imogene, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 16.5 °C (high). Annual precipitation averages 886.7 Millimeters. Imogene is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.3 °C | 0.3 °C | 21.08 mm |
| February | -8 °C | 3.1 °C | 28.19 mm |
| March | -2 °C | 10.4 °C | 47.5 mm |
| April | 3.8 °C | 17.1 °C | 86.11 mm |
| May | 10.6 °C | 22.7 °C | 143.26 mm |
| June | 16.4 °C | 27.9 °C | 135.38 mm |
| July | 18.6 °C | 29.8 °C | 102.11 mm |
| August | 17.2 °C | 28.9 °C | 92.46 mm |
| September | 12 °C | 25.6 °C | 82.04 mm |
| October | 5.3 °C | 18.8 °C | 72.14 mm |
| November | -1.7 °C | 9.9 °C | 43.43 mm |
| December | -7.2 °C | 2.9 °C | 33.02 mm |
| Annual | 4.6 °C | 16.5 °C | 886.72 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |