Franklin, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.4 °F (low) to 59.7 °F (high). Annual precipitation averages 46.8 Inches. Franklin is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.5 °F | 35.9 °F | 3.57 in. |
| February | 20.9 °F | 38.8 °F | 3.29 in. |
| March | 27.6 °F | 47.5 °F | 4.03 in. |
| April | 38.3 °F | 61.9 °F | 4.3 in. |
| May | 48.3 °F | 71.6 °F | 4.3 in. |
| June | 56.7 °F | 79.2 °F | 4.65 in. |
| July | 60.6 °F | 83.1 °F | 4.53 in. |
| August | 59.1 °F | 81.6 °F | 4.41 in. |
| September | 52.5 °F | 75.3 °F | 4.38 in. |
| October | 41.4 °F | 63.5 °F | 3.56 in. |
| November | 32.0 °F | 50.9 °F | 3.54 in. |
| December | 25.1 °F | 40.2 °F | 3.89 in. |
| Annual | 40.2 °F | 60.8 °F | 48.45 in. |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.7 °F | 34.4 °F | 3.37 in. |
| February | 18.0 °F | 37.1 °F | 2.64 in. |
| March | 25.1 °F | 46.0 °F | 3.53 in. |
| April | 35.1 °F | 59.7 °F | 4.19 in. |
| May | 45.9 °F | 71.2 °F | 3.92 in. |
| June | 55.3 °F | 78.9 °F | 5.11 in. |
| July | 59.3 °F | 82.8 °F | 5.28 in. |
| August | 58.0 °F | 81.4 °F | 4.16 in. |
| September | 51.3 °F | 74.7 °F | 3.95 in. |
| October | 40.4 °F | 62.4 °F | 3.77 in. |
| November | 31.2 °F | 49.5 °F | 3.4 in. |
| December | 23.8 °F | 38.8 °F | 3.49 in. |
| Annual | 38.4 °F | 59.7 °F | 46.81 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |