Castanea, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.9 °F (low) to 61.3 °F (high). Annual precipitation averages 42.3 Inches. Castanea is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.9 °F | 35.2 °F | 2.86 in. |
| February | 19.9 °F | 38.7 °F | 2.27 in. |
| March | 27.2 °F | 48.1 °F | 3.17 in. |
| April | 37.3 °F | 62.1 °F | 3.57 in. |
| May | 47.8 °F | 73.1 °F | 3.89 in. |
| June | 57.0 °F | 80.7 °F | 3.85 in. |
| July | 61.4 °F | 85.2 °F | 4.43 in. |
| August | 59.8 °F | 83.1 °F | 4.32 in. |
| September | 52.5 °F | 75.6 °F | 4.4 in. |
| October | 41.2 °F | 63.9 °F | 3.54 in. |
| November | 31.6 °F | 50.8 °F | 2.98 in. |
| December | 24.7 °F | 39.6 °F | 3.04 in. |
| Annual | 39.9 °F | 61.3 °F | 42.32 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |