Ralston, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 16.4 °C (high). Annual precipitation averages 829 Millimeters. Ralston is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.9 °C | 0.2 °C | 20.83 mm |
| February | -7.8 °C | 2.9 °C | 27.43 mm |
| March | -2 °C | 10 °C | 45.21 mm |
| April | 4.1 °C | 16.9 °C | 86.36 mm |
| May | 10.8 °C | 22.5 °C | 124.71 mm |
| June | 16.7 °C | 28.2 °C | 123.95 mm |
| July | 19.1 °C | 30.1 °C | 86.61 mm |
| August | 17.7 °C | 29.1 °C | 100.58 mm |
| September | 12.3 °C | 25.6 °C | 77.72 mm |
| October | 5.4 °C | 18.3 °C | 65.53 mm |
| November | -1.7 °C | 9.7 °C | 37.85 mm |
| December | -7.2 °C | 2.7 °C | 32.26 mm |
| Annual | 4.8 °C | 16.4 °C | 829.04 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |