Polk, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 15.3 °C (high). Annual precipitation averages 1017 Millimeters. Polk is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 0.7 °C | 72.39 mm |
| February | -7.3 °C | 2.2 °C | 53.34 mm |
| March | -2.8 °C | 7.7 °C | 74.42 mm |
| April | 3.2 °C | 15.6 °C | 94.49 mm |
| May | 9.2 °C | 21.4 °C | 104.39 mm |
| June | 14.3 °C | 26.2 °C | 113.54 mm |
| July | 16.1 °C | 28.2 °C | 105.66 mm |
| August | 15.2 °C | 27.3 °C | 93.22 mm |
| September | 11.3 °C | 24.1 °C | 86.11 mm |
| October | 5.2 °C | 17 °C | 77.98 mm |
| November | -0.2 °C | 9.5 °C | 73.15 mm |
| December | -4.7 °C | 3.2 °C | 68.33 mm |
| Annual | 4.3 °C | 15.3 °C | 1017.02 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |