| 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 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 82e - Central Maine Embayment | |
| Current Drought Status: | Moderate Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04978 - Smithfield, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 8 | 19 | 31 | 42 | 51 | 57 | 55 | 46 | 36 | 27 | 14 | 33 |
| Avg Max Temp (°F) | 28 | 31 | 41 | 52 | 66 | 75 | 80 | 78 | 69 | 58 | 45 | 33 | 55 |
| Avg Precip (In.) | 3.39 | 2.5 | 3.57 | 3.57 | 3.8 | 3.85 | 3.54 | 3.51 | 3.63 | 3.89 | 3.76 | 3.46 | 42.46 |