Brooks, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 12.3 °C (high). Annual precipitation averages 1224.3 Millimeters. Brooks is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.8 °C | -2.7 °C | 93.98 mm |
| February | -12.1 °C | -0.7 °C | 81.79 mm |
| March | -6.6 °C | 3.9 °C | 98.04 mm |
| April | 0.7 °C | 11.3 °C | 109.73 mm |
| May | 6.9 °C | 18 °C | 94.49 mm |
| June | 11.9 °C | 22.9 °C | 108.71 mm |
| July | 15.2 °C | 26.1 °C | 84.84 mm |
| August | 14.3 °C | 25.6 °C | 88.14 mm |
| September | 9.9 °C | 21.2 °C | 99.57 mm |
| October | 3.9 °C | 13.7 °C | 137.16 mm |
| November | -1.2 °C | 7.1 °C | 113.28 mm |
| December | -7.7 °C | 0.7 °C | 114.55 mm |
| Annual | 1.9 °C | 12.3 °C | 1224.28 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |