| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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 1b: -15F to -10F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 82f - Midcoast | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04011 - Brunswick, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 13 | 23 | 33 | 43 | 52 | 58 | 57 | 48 | 37 | 29 | 17 | 35 |
| Avg Max Temp (°F) | 31 | 34 | 42 | 54 | 65 | 74 | 80 | 79 | 70 | 59 | 47 | 36 | 56 |
| Avg Precip (In.) | 4.05 | 3.46 | 4.5 | 4.39 | 4.01 | 3.62 | 3.31 | 3.17 | 3.68 | 4.15 | 4.81 | 4.42 | 47.56 |