| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 82f - Midcoast |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04864 - Warren, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 14 | 24 | 33 | 43 | 53 | 58 | 57 | 50 | 39 | 31 | 19 | 36 |
| Avg Max Temp (°F) | 31 | 33 | 41 | 52 | 63 | 72 | 77 | 77 | 68 | 58 | 47 | 36 | 55 |
| Avg Precip (In.) | 4.49 | 3.73 | 4.51 | 4.16 | 3.89 | 3.57 | 3.41 | 2.76 | 4.09 | 4.05 | 4.99 | 4.34 | 47.97 |