Brookline, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.5 °F (low) to 60.2 °F (high). Annual precipitation averages 49.8 Inches. Brookline is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.5 °F | 36.8 °F | 4.0 in. |
| February | 21.1 °F | 39.3 °F | 3.64 in. |
| March | 28.3 °F | 46.0 °F | 4.87 in. |
| April | 38.5 °F | 57.8 °F | 4.31 in. |
| May | 48.3 °F | 68.2 °F | 3.68 in. |
| June | 57.7 °F | 77.4 °F | 4.18 in. |
| July | 63.7 °F | 83.2 °F | 3.7 in. |
| August | 62.2 °F | 81.5 °F | 3.77 in. |
| September | 54.9 °F | 74.5 °F | 3.77 in. |
| October | 43.6 °F | 62.9 °F | 4.84 in. |
| November | 34.2 °F | 52.3 °F | 4.05 in. |
| December | 25.9 °F | 42.4 °F | 4.95 in. |
| Annual | 41.5 °F | 60.2 °F | 49.76 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |