Elk Horn, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.9 °F (low) to 59 °F (high). Annual precipitation averages 34.4 Inches. Elk Horn 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 | 10.9 °F | 29.1 °F | 0.81 in. |
| February | 15.0 °F | 33.9 °F | 1.1 in. |
| March | 25.8 °F | 47.2 °F | 1.87 in. |
| April | 36.6 °F | 60.4 °F | 3.56 in. |
| May | 49.0 °F | 70.8 °F | 5.15 in. |
| June | 59.4 °F | 80.5 °F | 4.88 in. |
| July | 63.2 °F | 83.8 °F | 3.9 in. |
| August | 60.4 °F | 81.8 °F | 4.08 in. |
| September | 51.5 °F | 75.9 °F | 3.38 in. |
| October | 39.6 °F | 63.2 °F | 2.77 in. |
| November | 26.8 °F | 47.0 °F | 1.57 in. |
| December | 16.8 °F | 34.1 °F | 1.32 in. |
| Annual | 37.9 °F | 59 °F | 34.39 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |