Prosser, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4 °C (low) to 16.8 °C (high). Annual precipitation averages 698.8 Millimeters. Prosser 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 | -9.4 °C | 2.1 °C | 14.99 mm |
| February | -7.8 °C | 4.1 °C | 18.8 mm |
| March | -2.6 °C | 10.8 °C | 36.58 mm |
| April | 3.1 °C | 16.5 °C | 70.1 mm |
| May | 9.4 °C | 22.1 °C | 118.11 mm |
| June | 15.4 °C | 28.2 °C | 99.06 mm |
| July | 18 °C | 30.6 °C | 97.03 mm |
| August | 16.7 °C | 29.3 °C | 86.11 mm |
| September | 11.5 °C | 25.7 °C | 53.59 mm |
| October | 4.1 °C | 18.4 °C | 52.58 mm |
| November | -2.8 °C | 10.6 °C | 29.97 mm |
| December | -7.9 °C | 3.7 °C | 21.84 mm |
| Annual | 4 °C | 16.8 °C | 698.76 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |