Brownville, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 17.4 °C (high). Annual precipitation averages 858.5 Millimeters. Brownville 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.7 °C | 1.3 °C | 19.81 mm |
| February | -7.3 °C | 4.3 °C | 28.45 mm |
| March | -1.4 °C | 11.5 °C | 50.04 mm |
| April | 4.5 °C | 17.9 °C | 80.01 mm |
| May | 11.3 °C | 23.6 °C | 134.62 mm |
| June | 16.9 °C | 28.7 °C | 119.63 mm |
| July | 19 °C | 30.6 °C | 113.28 mm |
| August | 17.5 °C | 29.8 °C | 90.42 mm |
| September | 12.3 °C | 26.4 °C | 81.79 mm |
| October | 5.5 °C | 19.7 °C | 65.02 mm |
| November | -1.4 °C | 10.8 °C | 44.96 mm |
| December | -6.9 °C | 3.9 °C | 30.48 mm |
| Annual | 5 °C | 17.4 °C | 858.51 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |