Eldon, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.5 °F (low) to 61.9 °F (high). Annual precipitation averages 38.6 Inches. Eldon is located in USDA Plant Hardiness Zone 6a. 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 | 15.4 °F | 32.6 °F | 1.36 in. |
| February | 19.0 °F | 37.2 °F | 1.67 in. |
| March | 29.8 °F | 50.2 °F | 2.29 in. |
| April | 40.8 °F | 63.4 °F | 3.81 in. |
| May | 52.0 °F | 73.3 °F | 5.3 in. |
| June | 61.9 °F | 82.8 °F | 5.27 in. |
| July | 65.2 °F | 86.6 °F | 4.28 in. |
| August | 63.6 °F | 84.9 °F | 4.03 in. |
| September | 54.7 °F | 78.2 °F | 3.77 in. |
| October | 43.3 °F | 65.6 °F | 2.9 in. |
| November | 31.5 °F | 49.9 °F | 2.24 in. |
| December | 21.3 °F | 37.5 °F | 1.65 in. |
| Annual | 41.5 °F | 61.9 °F | 38.57 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |