Southampton, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38 °F (low) to 59.1 °F (high). Annual precipitation averages 49.5 Inches. Southampton is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.9 °F | 33.4 °F | 3.46 in. |
| February | 16.3 °F | 36.3 °F | 3.13 in. |
| March | 24.9 °F | 44.7 °F | 3.97 in. |
| April | 35.8 °F | 58.4 °F | 4.08 in. |
| May | 46.3 °F | 69.8 °F | 3.78 in. |
| June | 55.5 °F | 78.0 °F | 4.56 in. |
| July | 61.0 °F | 83.1 °F | 4.16 in. |
| August | 59.0 °F | 81.3 °F | 4.28 in. |
| September | 51.2 °F | 74.1 °F | 4.67 in. |
| October | 39.8 °F | 61.7 °F | 5.19 in. |
| November | 30.3 °F | 49.8 °F | 3.72 in. |
| December | 21.5 °F | 38.9 °F | 4.48 in. |
| Annual | 38 °F | 59.1 °F | 49.48 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |