Twilight, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.5 °F (low) to 62.4 °F (high). Annual precipitation averages 42.1 Inches. Twilight is located in USDA Plant Hardiness Zone 6b. 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 | 21.2 °F | 38.0 °F | 3.11 in. |
| February | 22.2 °F | 40.6 °F | 2.75 in. |
| March | 29.2 °F | 50.1 °F | 3.49 in. |
| April | 38.8 °F | 63.1 °F | 3.45 in. |
| May | 49.3 °F | 72.4 °F | 4.2 in. |
| June | 58.1 °F | 80.1 °F | 4.46 in. |
| July | 62.3 °F | 84.0 °F | 4.19 in. |
| August | 61.0 °F | 83.1 °F | 3.67 in. |
| September | 53.9 °F | 76.9 °F | 3.46 in. |
| October | 42.5 °F | 64.8 °F | 3.0 in. |
| November | 33.0 °F | 52.8 °F | 3.15 in. |
| December | 26.3 °F | 42.3 °F | 3.2 in. |
| Annual | 41.5 °F | 62.4 °F | 42.13 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |