Franklintown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.2 °C (low) to 16.9 °C (high). Annual precipitation averages 1163.1 Millimeters. Franklintown is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.5 °C | 3.5 °C | 83.06 mm |
| February | -4.9 °C | 4.9 °C | 69.09 mm |
| March | -0.8 °C | 9.8 °C | 101.6 mm |
| April | 5.2 °C | 16.7 °C | 93.22 mm |
| May | 10.6 °C | 22.1 °C | 106.68 mm |
| June | 15.7 °C | 26.9 °C | 103.12 mm |
| July | 18.2 °C | 29.8 °C | 105.41 mm |
| August | 17.2 °C | 28.6 °C | 98.81 mm |
| September | 13.2 °C | 24.7 °C | 125.98 mm |
| October | 6.9 °C | 18.2 °C | 102.36 mm |
| November | 1.3 °C | 11.9 °C | 82.55 mm |
| December | -2.8 °C | 5.7 °C | 91.19 mm |
| Annual | 6.2 °C | 16.9 °C | 1163.07 mm |
| 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |