Rowley, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 14.9 °C (high). Annual precipitation averages 1254.5 Millimeters. Rowley is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 1.9 °C | 97.28 mm |
| February | -7 °C | 3.3 °C | 93.47 mm |
| March | -3 °C | 7 °C | 123.95 mm |
| April | 2.4 °C | 13.7 °C | 109.22 mm |
| May | 7.9 °C | 19.2 °C | 95.25 mm |
| June | 13.4 °C | 24.3 °C | 110.49 mm |
| July | 16.6 °C | 27.7 °C | 90.68 mm |
| August | 15.8 °C | 27 °C | 86.87 mm |
| September | 11.8 °C | 23 °C | 98.04 mm |
| October | 5.6 °C | 16.5 °C | 123.19 mm |
| November | 0.4 °C | 10.5 °C | 101.85 mm |
| December | -4.3 °C | 4.9 °C | 124.21 mm |
| Annual | 4.3 °C | 14.9 °C | 1254.5 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |