Polk, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.5 °F (low) to 59.4 °F (high). Annual precipitation averages 46.4 Inches. Polk is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.6 °F | 34.1 °F | 3.35 in. |
| February | 18.1 °F | 36.9 °F | 2.61 in. |
| March | 25.2 °F | 45.8 °F | 3.46 in. |
| April | 35.5 °F | 59.3 °F | 4.14 in. |
| May | 46.1 °F | 70.6 °F | 3.93 in. |
| June | 55.3 °F | 78.4 °F | 5.05 in. |
| July | 59.4 °F | 82.2 °F | 5.1 in. |
| August | 58.0 °F | 80.9 °F | 4.12 in. |
| September | 51.3 °F | 74.2 °F | 4.03 in. |
| October | 40.5 °F | 62.0 °F | 3.69 in. |
| November | 31.5 °F | 49.4 °F | 3.41 in. |
| December | 23.8 °F | 38.5 °F | 3.48 in. |
| Annual | 38.5 °F | 59.4 °F | 46.37 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |