Lynn, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.8 °C (low) to 15 °C (high). Annual precipitation averages 1226.3 Millimeters. Lynn 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 | -6.2 °C | 2.6 °C | 98.04 mm |
| February | -5.2 °C | 3.7 °C | 91.19 mm |
| March | -1.5 °C | 7.2 °C | 119.63 mm |
| April | 3.9 °C | 13.4 °C | 106.68 mm |
| May | 9.2 °C | 18.8 °C | 89.66 mm |
| June | 14.6 °C | 24.1 °C | 104.65 mm |
| July | 17.8 °C | 27.4 °C | 91.69 mm |
| August | 17.2 °C | 26.7 °C | 88.65 mm |
| September | 13.3 °C | 22.8 °C | 93.47 mm |
| October | 7.4 °C | 16.6 °C | 120.9 mm |
| November | 2.2 °C | 10.8 °C | 101.09 mm |
| December | -2.7 °C | 5.6 °C | 120.65 mm |
| Annual | 5.8 °C | 15 °C | 1226.3 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 |