Eldon, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 16.6 °C (high). Annual precipitation averages 979.7 Millimeters. 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 | -9.2 °C | 0.3 °C | 34.54 mm |
| February | -7.2 °C | 2.9 °C | 42.42 mm |
| March | -1.2 °C | 10.1 °C | 58.17 mm |
| April | 4.9 °C | 17.4 °C | 96.77 mm |
| May | 11.1 °C | 22.9 °C | 134.62 mm |
| June | 16.6 °C | 28.2 °C | 133.86 mm |
| July | 18.4 °C | 30.3 °C | 108.71 mm |
| August | 17.6 °C | 29.4 °C | 102.36 mm |
| September | 12.6 °C | 25.7 °C | 95.76 mm |
| October | 6.3 °C | 18.7 °C | 73.66 mm |
| November | -0.3 °C | 9.9 °C | 56.9 mm |
| December | -5.9 °C | 3.1 °C | 41.91 mm |
| Annual | 5.3 °C | 16.6 °C | 979.68 mm |
| 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 : -23.3°C to -20.6°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 |