| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°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: | 59d - Boston Basin | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 02186 - Milton, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 21 | 28 | 37 | 47 | 56 | 62 | 61 | 53 | 43 | 34 | 24 | 40 |
| Avg Max Temp (°F) | 35 | 37 | 46 | 56 | 68 | 76 | 82 | 80 | 72 | 61 | 50 | 40 | 59 |
| Avg Precip (In.) | 4.63 | 3.92 | 4.65 | 4.21 | 3.71 | 3.67 | 3.63 | 4.03 | 4.01 | 4.28 | 4.58 | 4.42 | 49.74 |