Brewster, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.8 °C (low) to 12.6 °C (high). Annual precipitation averages 767.1 Millimeters. Brewster is located in USDA Plant Hardiness Zone 5a. 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 | -14.3 °C | -4.9 °C | 18.54 mm |
| February | -12.1 °C | -2.5 °C | 21.59 mm |
| March | -5.6 °C | 4.4 °C | 39.37 mm |
| April | 1.2 °C | 12.9 °C | 76.45 mm |
| May | 8.3 °C | 19.9 °C | 108.2 mm |
| June | 14.5 °C | 25.7 °C | 116.33 mm |
| July | 16.6 °C | 27.8 °C | 92.2 mm |
| August | 15.1 °C | 26.3 °C | 93.22 mm |
| September | 10.3 °C | 22.8 °C | 82.04 mm |
| October | 2.9 °C | 14.9 °C | 59.18 mm |
| November | -4.3 °C | 5.7 °C | 34.54 mm |
| December | -10.9 °C | -2.1 °C | 25.4 mm |
| Annual | 1.8 °C | 12.6 °C | 767.06 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |