Polk, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 15.2 °C (high). Annual precipitation averages 1177.8 Millimeters. 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 | -8 °C | 1.2 °C | 85.09 mm |
| February | -7.7 °C | 2.7 °C | 66.29 mm |
| March | -3.8 °C | 7.7 °C | 87.88 mm |
| April | 1.9 °C | 15.2 °C | 105.16 mm |
| May | 7.8 °C | 21.4 °C | 99.82 mm |
| June | 12.9 °C | 25.8 °C | 128.27 mm |
| July | 15.2 °C | 27.9 °C | 129.54 mm |
| August | 14.4 °C | 27.2 °C | 104.65 mm |
| September | 10.7 °C | 23.4 °C | 102.36 mm |
| October | 4.7 °C | 16.7 °C | 93.73 mm |
| November | -0.3 °C | 9.7 °C | 86.61 mm |
| December | -4.6 °C | 3.6 °C | 88.39 mm |
| Annual | 3.6 °C | 15.2 °C | 1177.79 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |