| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°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: | 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 02445 - Brookline, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 21 | 28 | 38 | 48 | 57 | 63 | 61 | 53 | 42 | 34 | 24 | 41 |
| Avg Max Temp (°F) | 35 | 38 | 46 | 57 | 68 | 77 | 82 | 80 | 73 | 62 | 51 | 40 | 59 |
| Avg Precip (In.) | 4.32 | 3.64 | 4.35 | 4.05 | 3.58 | 3.5 | 3.45 | 3.76 | 3.81 | 4.12 | 4.43 | 4.19 | 47.19 |