Rockport, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.5 °F (low) to 56.4 °F (high). Annual precipitation averages 50.5 Inches. Rockport is located in USDA Plant Hardiness Zone 7a. 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 | 23.3 °F | 36.1 °F | 4.36 in. |
| February | 24.5 °F | 37.4 °F | 4.14 in. |
| March | 30.3 °F | 42.8 °F | 5.32 in. |
| April | 38.9 °F | 53.1 °F | 4.43 in. |
| May | 48.1 °F | 62.5 °F | 3.87 in. |
| June | 57.2 °F | 71.7 °F | 4.06 in. |
| July | 63.6 °F | 76.7 °F | 3.48 in. |
| August | 63.3 °F | 76.2 °F | 3.28 in. |
| September | 57.7 °F | 69.4 °F | 3.75 in. |
| October | 47.5 °F | 59.7 °F | 4.81 in. |
| November | 38.0 °F | 50.1 °F | 3.97 in. |
| December | 29.4 °F | 41.5 °F | 5.07 in. |
| Annual | 43.5 °F | 56.4 °F | 50.54 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 7a : 0°F to 5°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 |