Fort Washington, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.6 °C (low) to 17.8 °C (high). Annual precipitation averages 1218.2 Millimeters. Fort Washington is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.1 °C | 4.6 °C | 85.85 mm |
| February | -3.3 °C | 6.2 °C | 70.61 mm |
| March | 0.5 °C | 10.7 °C | 104.9 mm |
| April | 6.1 °C | 17.4 °C | 94.74 mm |
| May | 11.6 °C | 22.7 °C | 103.89 mm |
| June | 16.9 °C | 27.7 °C | 111.51 mm |
| July | 19.9 °C | 30.3 °C | 118.36 mm |
| August | 18.9 °C | 29.3 °C | 121.92 mm |
| September | 14.9 °C | 25.7 °C | 111.51 mm |
| October | 8.3 °C | 19.1 °C | 102.11 mm |
| November | 2.8 °C | 12.9 °C | 82.3 mm |
| December | -1.2 °C | 7.3 °C | 110.49 mm |
| Annual | 7.6 °C | 17.8 °C | 1218.19 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |