| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 59d - Boston Basin | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01940 - Lynnfield, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 20 | 28 | 37 | 47 | 56 | 62 | 60 | 52 | 42 | 34 | 23 | 40 |
| Avg Max Temp (°F) | 36 | 39 | 47 | 57 | 68 | 77 | 83 | 81 | 73 | 62 | 51 | 41 | 60 |
| Avg Precip (In.) | 4.1 | 3.41 | 4.15 | 4.15 | 3.66 | 3.58 | 3.49 | 3.47 | 3.76 | 4.2 | 4.52 | 4.14 | 46.63 |