Milton, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 42 °F (low) to 60.2 °F (high). Annual precipitation averages 50.5 Inches. Milton is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.1 °F | 37.0 °F | 4.07 in. |
| February | 21.6 °F | 39.4 °F | 3.66 in. |
| March | 28.7 °F | 46.2 °F | 4.97 in. |
| April | 38.9 °F | 57.8 °F | 4.43 in. |
| May | 48.5 °F | 68.3 °F | 3.72 in. |
| June | 58.1 °F | 77.3 °F | 4.18 in. |
| July | 64.2 °F | 83.1 °F | 3.73 in. |
| August | 62.8 °F | 81.6 °F | 3.77 in. |
| September | 55.6 °F | 74.4 °F | 3.89 in. |
| October | 44.3 °F | 62.8 °F | 4.96 in. |
| November | 34.9 °F | 52.3 °F | 4.17 in. |
| December | 26.4 °F | 42.5 °F | 4.98 in. |
| Annual | 42 °F | 60.2 °F | 50.53 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |