| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F | |
| Average First Frost Date: | Nov. 1 - Nov. 10 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| 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 02152 - Winthrop, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 23 | 30 | 39 | 49 | 58 | 64 | 63 | 55 | 45 | 37 | 26 | 43 |
| Avg Max Temp (°F) | 36 | 39 | 46 | 56 | 67 | 77 | 82 | 80 | 73 | 62 | 52 | 41 | 59 |
| Avg Precip (In.) | 4.05 | 3.42 | 4.02 | 3.72 | 3.33 | 3.29 | 3.13 | 3.46 | 3.55 | 3.88 | 4.11 | 3.87 | 43.83 |