Rockport, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 13.6 °C (high). Annual precipitation averages 1283.7 Millimeters. 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 | -4.8 °C | 2.3 °C | 110.74 mm |
| February | -4.2 °C | 3 °C | 105.16 mm |
| March | -0.9 °C | 6 °C | 135.13 mm |
| April | 3.8 °C | 11.7 °C | 112.52 mm |
| May | 8.9 °C | 16.9 °C | 98.3 mm |
| June | 14 °C | 22.1 °C | 103.12 mm |
| July | 17.6 °C | 24.8 °C | 88.39 mm |
| August | 17.4 °C | 24.6 °C | 83.31 mm |
| September | 14.3 °C | 20.8 °C | 95.25 mm |
| October | 8.6 °C | 15.4 °C | 122.17 mm |
| November | 3.3 °C | 10.1 °C | 100.84 mm |
| December | -1.4 °C | 5.3 °C | 128.78 mm |
| Annual | 6.4 °C | 13.6 °C | 1283.71 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |