Imogene, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.2 °F (low) to 61.6 °F (high). Annual precipitation averages 34.9 Inches. 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 | 13.5 °F | 32.5 °F | 0.83 in. |
| February | 17.6 °F | 37.6 °F | 1.11 in. |
| March | 28.4 °F | 50.7 °F | 1.87 in. |
| April | 38.9 °F | 62.7 °F | 3.39 in. |
| May | 51.1 °F | 72.9 °F | 5.64 in. |
| June | 61.6 °F | 82.2 °F | 5.33 in. |
| July | 65.5 °F | 85.6 °F | 4.02 in. |
| August | 62.9 °F | 84.1 °F | 3.64 in. |
| September | 53.6 °F | 78.0 °F | 3.23 in. |
| October | 41.6 °F | 65.8 °F | 2.84 in. |
| November | 28.9 °F | 49.9 °F | 1.71 in. |
| December | 19.0 °F | 37.3 °F | 1.3 in. |
| Annual | 40.2 °F | 61.6 °F | 34.91 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |