Brewster, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 15.9 °C (high). Annual precipitation averages 1043.7 Millimeters. Brewster is located in USDA Plant Hardiness Zone 6b. 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 | -6.8 °C | 1.6 °C | 75.44 mm |
| February | -6.2 °C | 3.3 °C | 57.4 mm |
| March | -1.9 °C | 8.7 °C | 80.77 mm |
| April | 3.9 °C | 16.2 °C | 93.22 mm |
| May | 9.8 °C | 21.9 °C | 102.11 mm |
| June | 14.7 °C | 26.6 °C | 120.14 mm |
| July | 16.8 °C | 28.4 °C | 106.17 mm |
| August | 15.8 °C | 27.8 °C | 96.77 mm |
| September | 11.9 °C | 24.3 °C | 83.31 mm |
| October | 5.7 °C | 17.6 °C | 81.03 mm |
| November | 0.4 °C | 10.4 °C | 73.66 mm |
| December | -3.7 °C | 4.3 °C | 73.66 mm |
| Annual | 5 °C | 15.9 °C | 1043.68 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |