Sumner, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.1 °F (low) to 62.8 °F (high). Annual precipitation averages 24 Inches. Sumner is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.0 °F | 37.3 °F | 0.4 in. |
| February | 16.9 °F | 41.2 °F | 0.62 in. |
| March | 25.7 °F | 52.2 °F | 1.3 in. |
| April | 35.5 °F | 62.0 °F | 2.49 in. |
| May | 46.5 °F | 71.9 °F | 4.02 in. |
| June | 57.5 °F | 82.4 °F | 3.77 in. |
| July | 62.3 °F | 87.1 °F | 3.3 in. |
| August | 60.1 °F | 84.7 °F | 3.01 in. |
| September | 50.1 °F | 78.5 °F | 1.84 in. |
| October | 36.8 °F | 65.7 °F | 1.73 in. |
| November | 24.4 °F | 51.1 °F | 0.88 in. |
| December | 15.7 °F | 39.5 °F | 0.63 in. |
| Annual | 37.1 °F | 62.8 °F | 23.99 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |