| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | 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 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 59h - Gulf of Maine Coastal Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04073 - Sanford, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 14 | 23 | 32 | 43 | 52 | 58 | 56 | 48 | 37 | 29 | 18 | 35 |
| Avg Max Temp (°F) | 32 | 36 | 45 | 57 | 70 | 78 | 83 | 80 | 72 | 61 | 48 | 36 | 58 |
| Avg Precip (In.) | 4.17 | 3.65 | 4.61 | 4.56 | 3.99 | 3.68 | 4 | 3.77 | 3.77 | 4.44 | 4.89 | 4.32 | 49.85 |