Franklin, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.5 °F (low) to 54.3 °F (high). Annual precipitation averages 48.4 Inches. Franklin is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.1 °F | 29.2 °F | 3.9 in. |
| February | 10.9 °F | 31.8 °F | 3.31 in. |
| March | 21.4 °F | 39.5 °F | 4.11 in. |
| April | 31.6 °F | 51.8 °F | 4.25 in. |
| May | 42.2 °F | 62.9 °F | 3.84 in. |
| June | 50.9 °F | 71.9 °F | 3.97 in. |
| July | 57.7 °F | 77.7 °F | 3.32 in. |
| August | 56.1 °F | 77.4 °F | 3.2 in. |
| September | 48.8 °F | 70.2 °F | 3.78 in. |
| October | 37.9 °F | 57.7 °F | 5.26 in. |
| November | 29.1 °F | 46.0 °F | 4.76 in. |
| December | 17.7 °F | 35.1 °F | 4.72 in. |
| Annual | 34.5 °F | 54.3 °F | 48.42 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |