Heartwell, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.9 °F (low) to 62.7 °F (high). Annual precipitation averages 26.3 Inches. Heartwell 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.0 °F | 35.9 °F | 0.52 in. |
| February | 17.9 °F | 39.7 °F | 0.66 in. |
| March | 27.0 °F | 51.5 °F | 1.42 in. |
| April | 37.1 °F | 62.0 °F | 2.55 in. |
| May | 48.5 °F | 72.3 °F | 4.39 in. |
| June | 59.5 °F | 83.2 °F | 3.87 in. |
| July | 64.2 °F | 87.7 °F | 3.74 in. |
| August | 61.8 °F | 85.3 °F | 3.26 in. |
| September | 52.4 °F | 78.7 °F | 1.97 in. |
| October | 39.1 °F | 65.7 °F | 2.06 in. |
| November | 26.4 °F | 51.2 °F | 1.06 in. |
| December | 17.6 °F | 39.1 °F | 0.75 in. |
| Annual | 38.9 °F | 62.7 °F | 26.25 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |