| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 82a - Aroostook Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04736 - Caribou, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -1 | 2 | 15 | 29 | 40 | 49 | 55 | 52 | 43 | 34 | 24 | 8 | 29 |
| Avg Max Temp (°F) | 20 | 23 | 34 | 47 | 63 | 72 | 77 | 75 | 65 | 52 | 38 | 25 | 49 |
| Avg Precip (In.) | 2.98 | 2.07 | 2.61 | 2.68 | 3.34 | 3.4 | 3.9 | 4.08 | 3.32 | 3.03 | 3.13 | 3.15 | 37.68 |