| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 59c - Southern New England Coastal Plains and Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01505 - Boylston, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 17 | 26 | 36 | 47 | 56 | 62 | 60 | 51 | 39 | 32 | 21 | 38 |
| Avg Max Temp (°F) | 33 | 35 | 44 | 55 | 68 | 76 | 81 | 79 | 71 | 60 | 49 | 38 | 58 |
| Avg Precip (In.) | 4.3 | 3.38 | 4.24 | 4.23 | 3.93 | 3.83 | 3.83 | 4.15 | 4.12 | 4.43 | 4.39 | 3.96 | 48.8 |