Overton, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.2 °C (low) to 17.3 °C (high). Annual precipitation averages 626.1 Millimeters. Overton 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 | -9.7 °C | 2.8 °C | 10.41 mm |
| February | -8.2 °C | 5.1 °C | 18.54 mm |
| March | -3.3 °C | 11.3 °C | 33.27 mm |
| April | 2.2 °C | 16.9 °C | 65.79 mm |
| May | 8.5 °C | 22.3 °C | 99.06 mm |
| June | 14.6 °C | 28.3 °C | 95 mm |
| July | 17.2 °C | 30.7 °C | 89.66 mm |
| August | 15.9 °C | 29.3 °C | 80.77 mm |
| September | 10.6 °C | 26 °C | 47.5 mm |
| October | 3.3 °C | 19.1 °C | 46.48 mm |
| November | -3.8 °C | 10.9 °C | 22.61 mm |
| December | -8.6 °C | 4.3 °C | 17.02 mm |
| Annual | 3.2 °C | 17.3 °C | 626.11 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |