Ellston, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.5 °F (low) to 59.9 °F (high). Annual precipitation averages 38 Inches. Ellston 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 | 12.8 °F | 31.2 °F | 0.91 in. |
| February | 16.8 °F | 36.1 °F | 1.34 in. |
| March | 27.5 °F | 48.8 °F | 2.17 in. |
| April | 38.4 °F | 60.7 °F | 4.04 in. |
| May | 50.3 °F | 70.5 °F | 5.45 in. |
| June | 60.4 °F | 80.0 °F | 5.16 in. |
| July | 64.6 °F | 84.3 °F | 4.38 in. |
| August | 62.2 °F | 82.8 °F | 4.26 in. |
| September | 53.1 °F | 75.7 °F | 3.94 in. |
| October | 40.9 °F | 63.5 °F | 2.82 in. |
| November | 28.9 °F | 48.7 °F | 2.09 in. |
| December | 18.4 °F | 36.2 °F | 1.42 in. |
| Annual | 39.5 °F | 59.9 °F | 37.98 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 |