| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| 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 04922 - Burnham, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 7 | 19 | 31 | 42 | 51 | 57 | 55 | 46 | 35 | 27 | 13 | 32 |
| Avg Max Temp (°F) | 28 | 31 | 41 | 53 | 67 | 75 | 80 | 78 | 70 | 58 | 45 | 33 | 55 |
| Avg Precip (In.) | 3.3 | 2.43 | 3.56 | 3.58 | 3.71 | 3.76 | 3.51 | 3.52 | 3.71 | 3.86 | 3.73 | 3.32 | 41.98 |