Brewster, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.6 °C (low) to 16.1 °C (high). Annual precipitation averages 614.9 Millimeters. Brewster is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.6 °C | 1.9 °C | 11.68 mm |
| February | -9.7 °C | 3.7 °C | 19.56 mm |
| March | -4.9 °C | 9.9 °C | 32 mm |
| April | 0.4 °C | 15.1 °C | 67.06 mm |
| May | 6.9 °C | 20.9 °C | 102.62 mm |
| June | 12.9 °C | 26.8 °C | 102.36 mm |
| July | 16 °C | 30.3 °C | 78.99 mm |
| August | 14.6 °C | 29.4 °C | 72.39 mm |
| September | 9 °C | 24.9 °C | 49.28 mm |
| October | 1.3 °C | 17.6 °C | 46.99 mm |
| November | -5.3 °C | 9.7 °C | 19.56 mm |
| December | -10.1 °C | 3.3 °C | 12.45 mm |
| Annual | 1.6 °C | 16.1 °C | 614.94 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |