Delta, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.4 °F (low) to 63.3 °F (high). Annual precipitation averages 47.2 Inches. Delta is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.2 °F | 39.9 °F | 3.39 in. |
| February | 24.3 °F | 42.6 °F | 2.75 in. |
| March | 31.3 °F | 51.2 °F | 4.11 in. |
| April | 41.3 °F | 63.5 °F | 3.68 in. |
| May | 51.1 °F | 72.8 °F | 3.9 in. |
| June | 59.8 °F | 80.6 °F | 4.36 in. |
| July | 64.7 °F | 85.0 °F | 4.48 in. |
| August | 62.9 °F | 83.7 °F | 4.18 in. |
| September | 56.1 °F | 77.0 °F | 4.74 in. |
| October | 44.4 °F | 65.8 °F | 4.39 in. |
| November | 34.6 °F | 54.0 °F | 3.28 in. |
| December | 27.5 °F | 44.0 °F | 3.97 in. |
| Annual | 43.4 °F | 63.3 °F | 47.23 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |