| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 82e - Central Maine Embayment |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04921 - Brooks, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 11 | 21 | 32 | 42 | 51 | 57 | 55 | 47 | 37 | 29 | 16 | 34 |
| Avg Max Temp (°F) | 29 | 32 | 41 | 52 | 64 | 73 | 78 | 77 | 69 | 57 | 45 | 34 | 54 |
| Avg Precip (In.) | 4 | 3 | 4.28 | 4.29 | 4.13 | 3.99 | 3.43 | 3.26 | 4.07 | 4.26 | 4.65 | 4.17 | 47.53 |