| 2023 Hardiness Zone: | 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: | 82e - Central Maine Embayment | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04240 - Lewiston, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 14 | 24 | 35 | 45 | 55 | 60 | 59 | 51 | 40 | 31 | 18 | 37 |
| Avg Max Temp (°F) | 29 | 33 | 42 | 54 | 67 | 76 | 81 | 79 | 70 | 58 | 45 | 34 | 56 |
| Avg Precip (In.) | 3.98 | 3.06 | 4.56 | 4.19 | 3.85 | 3.84 | 3.71 | 3.23 | 3.52 | 4.13 | 4.41 | 4.18 | 46.65 |