Cornwells Heights, Pennsylvania has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.8 °F (low) to 64.6 °F (high). Annual precipitation averages 47.8 Inches. Cornwells Heights 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.9 °F | 41.0 °F | 3.55 in. |
| February | 26.1 °F | 43.7 °F | 2.77 in. |
| March | 33.2 °F | 51.6 °F | 4.45 in. |
| April | 43.1 °F | 63.6 °F | 3.56 in. |
| May | 52.8 °F | 73.1 °F | 4.05 in. |
| June | 62.3 °F | 82.3 °F | 4.25 in. |
| July | 67.9 °F | 86.8 °F | 4.7 in. |
| August | 66.3 °F | 85.3 °F | 4.87 in. |
| September | 58.9 °F | 78.9 °F | 4.11 in. |
| October | 47.4 °F | 66.7 °F | 3.92 in. |
| November | 37.2 °F | 55.9 °F | 3.19 in. |
| December | 29.9 °F | 45.7 °F | 4.35 in. |
| Annual | 45.8 °F | 64.6 °F | 47.77 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |