Marienville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.9 °F (low) to 56.9 °F (high). Annual precipitation averages 48.5 Inches. Marienville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.8 °F | 31.4 °F | 3.7 in. |
| February | 15.3 °F | 34.0 °F | 2.77 in. |
| March | 22.6 °F | 43.2 °F | 3.53 in. |
| April | 33.5 °F | 57.6 °F | 4.3 in. |
| May | 43.9 °F | 68.6 °F | 4.38 in. |
| June | 52.4 °F | 76.1 °F | 5.0 in. |
| July | 56.0 °F | 80.0 °F | 4.82 in. |
| August | 54.9 °F | 78.5 °F | 4.16 in. |
| September | 48.4 °F | 71.7 °F | 4.14 in. |
| October | 37.9 °F | 59.5 °F | 3.84 in. |
| November | 29.3 °F | 46.8 °F | 3.88 in. |
| December | 21.6 °F | 35.9 °F | 3.94 in. |
| Annual | 35.9 °F | 56.9 °F | 48.46 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |