Nelson, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.1 °C (low) to 17.7 °C (high). Annual precipitation averages 697 Millimeters. Nelson is located in USDA Plant Hardiness Zone 6a. 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 | 2.6 °C | 14.99 mm |
| February | -7.7 °C | 5.1 °C | 19.05 mm |
| March | -2.6 °C | 11.7 °C | 37.08 mm |
| April | 3.1 °C | 17.7 °C | 63.5 mm |
| May | 9.6 °C | 23.1 °C | 111.76 mm |
| June | 15.8 °C | 29.1 °C | 98.3 mm |
| July | 18.3 °C | 31.4 °C | 107.19 mm |
| August | 16.9 °C | 30.2 °C | 85.85 mm |
| September | 11.6 °C | 26.4 °C | 56.9 mm |
| October | 4.4 °C | 19.3 °C | 51.56 mm |
| November | -2.6 °C | 11.1 °C | 31.5 mm |
| December | -7.7 °C | 4.3 °C | 19.3 mm |
| Annual | 4.1 °C | 17.7 °C | 696.98 mm |
| 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |