Ellsworth, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.4 °F (low) to 57.8 °F (high). Annual precipitation averages 36.6 Inches. Ellsworth 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 | 9.5 °F | 26.8 °F | 1.02 in. |
| February | 13.6 °F | 31.5 °F | 1.1 in. |
| March | 25.3 °F | 44.5 °F | 2.1 in. |
| April | 36.4 °F | 59.3 °F | 3.76 in. |
| May | 49.0 °F | 70.6 °F | 4.87 in. |
| June | 59.6 °F | 80.4 °F | 5.67 in. |
| July | 62.9 °F | 83.4 °F | 4.49 in. |
| August | 60.2 °F | 81.2 °F | 4.53 in. |
| September | 51.2 °F | 75.5 °F | 3.2 in. |
| October | 38.8 °F | 62.3 °F | 2.62 in. |
| November | 26.6 °F | 46.0 °F | 1.74 in. |
| December | 15.8 °F | 32.5 °F | 1.46 in. |
| Annual | 37.4 °F | 57.8 °F | 36.56 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 |