Falmouth, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7 °C (low) to 17.4 °C (high). Annual precipitation averages 1112 Millimeters. Falmouth is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 3.7 °C | 77.22 mm |
| February | -4.3 °C | 5.1 °C | 64.52 mm |
| March | 0.1 °C | 10.1 °C | 95 mm |
| April | 5.7 °C | 17.2 °C | 86.36 mm |
| May | 11.3 °C | 22.8 °C | 101.09 mm |
| June | 16.7 °C | 27.6 °C | 103.63 mm |
| July | 19.1 °C | 30.5 °C | 114.3 mm |
| August | 18.1 °C | 29.5 °C | 94.74 mm |
| September | 14.1 °C | 25.3 °C | 112.27 mm |
| October | 7.7 °C | 18.3 °C | 101.35 mm |
| November | 2.1 °C | 12.1 °C | 76.2 mm |
| December | -2.2 °C | 6.3 °C | 85.34 mm |
| Annual | 7 °C | 17.4 °C | 1112.02 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |