Franklin, Maryland has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.1 °F (low) to 63.6 °F (high). Annual precipitation averages 42 Inches. Franklin is located in USDA Plant Hardiness Zone 7a. 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 | 22.1 °F | 39.0 °F | 2.88 in. |
| February | 23.1 °F | 42.7 °F | 2.9 in. |
| March | 29.6 °F | 51.3 °F | 3.88 in. |
| April | 38.7 °F | 65.2 °F | 3.64 in. |
| May | 48.1 °F | 73.8 °F | 4.42 in. |
| June | 57.0 °F | 81.3 °F | 4.21 in. |
| July | 61.3 °F | 85.4 °F | 4.09 in. |
| August | 59.8 °F | 84.2 °F | 3.63 in. |
| September | 52.9 °F | 77.8 °F | 3.9 in. |
| October | 42.0 °F | 65.9 °F | 2.95 in. |
| November | 32.4 °F | 53.2 °F | 2.52 in. |
| December | 26.0 °F | 42.8 °F | 3.0 in. |
| Annual | 41.1 °F | 63.6 °F | 42.02 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |