Zion, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.1 °F (low) to 59.8 °F (high). Annual precipitation averages 43.5 Inches. Zion 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 | 18.2 °F | 34.5 °F | 2.93 in. |
| February | 19.3 °F | 37.7 °F | 2.41 in. |
| March | 26.3 °F | 46.6 °F | 3.5 in. |
| April | 36.9 °F | 60.3 °F | 3.44 in. |
| May | 47.2 °F | 71.0 °F | 4.58 in. |
| June | 56.3 °F | 78.5 °F | 3.86 in. |
| July | 60.4 °F | 83.0 °F | 4.14 in. |
| August | 58.6 °F | 81.1 °F | 4.3 in. |
| September | 51.3 °F | 74.0 °F | 4.05 in. |
| October | 40.3 °F | 62.1 °F | 3.96 in. |
| November | 31.0 °F | 50.0 °F | 3.1 in. |
| December | 23.7 °F | 38.9 °F | 3.26 in. |
| Annual | 39.1 °F | 59.8 °F | 43.53 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |