Prosser, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.1 °F (low) to 62.3 °F (high). Annual precipitation averages 27.5 Inches. 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 | 15.0 °F | 35.7 °F | 0.59 in. |
| February | 18.0 °F | 39.3 °F | 0.74 in. |
| March | 27.3 °F | 51.5 °F | 1.44 in. |
| April | 37.5 °F | 61.7 °F | 2.76 in. |
| May | 48.9 °F | 71.7 °F | 4.65 in. |
| June | 59.8 °F | 82.7 °F | 3.9 in. |
| July | 64.4 °F | 87.0 °F | 3.82 in. |
| August | 62.0 °F | 84.7 °F | 3.39 in. |
| September | 52.7 °F | 78.2 °F | 2.11 in. |
| October | 39.3 °F | 65.1 °F | 2.07 in. |
| November | 26.9 °F | 51.0 °F | 1.18 in. |
| December | 17.7 °F | 38.6 °F | 0.86 in. |
| Annual | 39.1 °F | 62.3 °F | 27.51 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |