Philadelphia, Pennsylvania has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.2 °F (low) to 65 °F (high). Annual precipitation averages 46.9 Inches. Philadelphia is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.2 °F | 41.6 °F | 3.49 in. |
| February | 28.7 °F | 44.4 °F | 2.8 in. |
| March | 35.2 °F | 52.3 °F | 4.33 in. |
| April | 45.3 °F | 64.3 °F | 3.56 in. |
| May | 54.9 °F | 73.5 °F | 3.84 in. |
| June | 64.4 °F | 82.8 °F | 4.25 in. |
| July | 70.0 °F | 87.4 °F | 4.58 in. |
| August | 68.4 °F | 85.6 °F | 4.8 in. |
| September | 61.8 °F | 79.1 °F | 4.13 in. |
| October | 50.1 °F | 67.0 °F | 3.81 in. |
| November | 39.9 °F | 56.2 °F | 3.04 in. |
| December | 32.6 °F | 46.3 °F | 4.25 in. |
| Annual | 48.2 °F | 65 °F | 46.88 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |