Yardley, Pennsylvania has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.8 °F (low) to 64.1 °F (high). Annual precipitation averages 48.4 Inches. Yardley 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 | 23.9 °F | 40.4 °F | 3.56 in. |
| February | 25.2 °F | 43.1 °F | 2.85 in. |
| March | 32.2 °F | 51.0 °F | 4.33 in. |
| April | 42.2 °F | 63.2 °F | 3.67 in. |
| May | 51.9 °F | 72.7 °F | 4.13 in. |
| June | 61.3 °F | 81.8 °F | 4.46 in. |
| July | 66.7 °F | 86.6 °F | 4.92 in. |
| August | 65.0 °F | 84.8 °F | 4.59 in. |
| September | 57.8 °F | 78.4 °F | 4.07 in. |
| October | 46.1 °F | 66.3 °F | 4.01 in. |
| November | 36.1 °F | 55.4 °F | 3.36 in. |
| December | 28.8 °F | 45.3 °F | 4.44 in. |
| Annual | 44.8 °F | 64.1 °F | 48.39 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 |