Brownfield, Maine has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 33.1 °F (low) to 55.6 °F (high). Annual precipitation averages 50.4 Inches. Brownfield 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 | 7.9 °F | 29.4 °F | 3.52 in. |
| February | 9.0 °F | 32.3 °F | 3.54 in. |
| March | 19.0 °F | 40.9 °F | 4.15 in. |
| April | 30.6 °F | 54.1 °F | 4.36 in. |
| May | 41.8 °F | 66.9 °F | 3.83 in. |
| June | 51.5 °F | 75.0 °F | 4.68 in. |
| July | 56.6 °F | 80.2 °F | 4.25 in. |
| August | 54.9 °F | 79.1 °F | 3.84 in. |
| September | 46.9 °F | 71.4 °F | 3.75 in. |
| October | 35.9 °F | 57.9 °F | 5.45 in. |
| November | 26.5 °F | 45.5 °F | 4.45 in. |
| December | 16.0 °F | 34.8 °F | 4.61 in. |
| Annual | 33.1 °F | 55.6 °F | 50.43 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |