Polk, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.7 °F (low) to 59.5 °F (high). Annual precipitation averages 40 Inches. 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 | 17.5 °F | 33.2 °F | 2.85 in. |
| February | 18.8 °F | 36.0 °F | 2.1 in. |
| March | 26.9 °F | 45.9 °F | 2.93 in. |
| April | 37.8 °F | 60.1 °F | 3.72 in. |
| May | 48.6 °F | 70.6 °F | 4.11 in. |
| June | 57.8 °F | 79.2 °F | 4.47 in. |
| July | 61.0 °F | 82.8 °F | 4.16 in. |
| August | 59.3 °F | 81.2 °F | 3.67 in. |
| September | 52.3 °F | 75.3 °F | 3.39 in. |
| October | 41.3 °F | 62.6 °F | 3.07 in. |
| November | 31.6 °F | 49.1 °F | 2.88 in. |
| December | 23.5 °F | 37.8 °F | 2.69 in. |
| Annual | 39.7 °F | 59.5 °F | 40.04 in. |
| 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 : -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 |