Thorndale, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.7 °F (low) to 63.1 °F (high). Annual precipitation averages 50.1 Inches. Thorndale is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.8 °F | 39.3 °F | 3.64 in. |
| February | 22.5 °F | 41.6 °F | 2.99 in. |
| March | 30.0 °F | 50.1 °F | 4.31 in. |
| April | 40.4 °F | 62.7 °F | 3.85 in. |
| May | 50.3 °F | 72.3 °F | 3.97 in. |
| June | 59.4 °F | 80.9 °F | 4.67 in. |
| July | 64.7 °F | 85.3 °F | 4.79 in. |
| August | 63.0 °F | 84.0 °F | 4.45 in. |
| September | 55.4 °F | 77.5 °F | 5.04 in. |
| October | 43.7 °F | 65.6 °F | 4.64 in. |
| November | 34.1 °F | 53.8 °F | 3.42 in. |
| December | 27.2 °F | 43.7 °F | 4.34 in. |
| Annual | 42.7 °F | 63.1 °F | 50.11 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |