| 2023 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 3a: -40°F to -35°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 58v - St. John Uplands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04774 - Saint Francis, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -5 | -3 | 10 | 25 | 37 | 48 | 53 | 50 | 41 | 32 | 22 | 4 | 26 |
| Avg Max Temp (°F) | 19 | 24 | 35 | 46 | 62 | 72 | 77 | 75 | 65 | 52 | 38 | 25 | 49 |
| Avg Precip (In.) | 2.94 | 1.97 | 2.54 | 2.69 | 3.51 | 3.65 | 4.08 | 4.45 | 3.64 | 3.37 | 3.11 | 3.08 | 39.04 |