Lynn, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.5 °F (low) to 58.9 °F (high). Annual precipitation averages 48.3 Inches. 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 | 20.9 °F | 36.6 °F | 3.86 in. |
| February | 22.6 °F | 38.7 °F | 3.59 in. |
| March | 29.3 °F | 45.0 °F | 4.71 in. |
| April | 39.0 °F | 56.1 °F | 4.2 in. |
| May | 48.6 °F | 65.8 °F | 3.53 in. |
| June | 58.2 °F | 75.3 °F | 4.12 in. |
| July | 64.0 °F | 81.4 °F | 3.61 in. |
| August | 63.0 °F | 80.0 °F | 3.49 in. |
| September | 56.0 °F | 73.0 °F | 3.68 in. |
| October | 45.3 °F | 61.8 °F | 4.76 in. |
| November | 35.9 °F | 51.5 °F | 3.98 in. |
| December | 27.2 °F | 42.1 °F | 4.75 in. |
| Annual | 42.5 °F | 58.9 °F | 48.28 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 |