Marion, 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 63.5 °F (high). Annual precipitation averages 42.5 Inches. Marion 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.9 °F | 39.1 °F | 3.18 in. |
| February | 24.2 °F | 42.5 °F | 2.46 in. |
| March | 31.4 °F | 51.3 °F | 3.61 in. |
| April | 41.5 °F | 63.8 °F | 3.85 in. |
| May | 51.2 °F | 73.1 °F | 4.14 in. |
| June | 60.1 °F | 81.8 °F | 4.02 in. |
| July | 64.5 °F | 86.1 °F | 3.7 in. |
| August | 62.7 °F | 84.3 °F | 3.67 in. |
| September | 55.7 °F | 77.5 °F | 3.98 in. |
| October | 44.3 °F | 65.6 °F | 3.59 in. |
| November | 34.7 °F | 53.9 °F | 2.95 in. |
| December | 27.2 °F | 43.0 °F | 3.38 in. |
| Annual | 43.4 °F | 63.5 °F | 42.53 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |