Columbiana, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.9 °F (low) to 60.3 °F (high). Annual precipitation averages 40.8 Inches. Columbiana 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.9 °F | 34.5 °F | 2.94 in. |
| February | 18.7 °F | 37.5 °F | 2.27 in. |
| March | 26.4 °F | 47.0 °F | 3.1 in. |
| April | 37.0 °F | 60.5 °F | 3.84 in. |
| May | 46.8 °F | 71.0 °F | 3.81 in. |
| June | 56.0 °F | 79.4 °F | 4.32 in. |
| July | 59.8 °F | 83.0 °F | 4.35 in. |
| August | 57.8 °F | 81.7 °F | 3.38 in. |
| September | 51.1 °F | 75.7 °F | 3.78 in. |
| October | 40.2 °F | 63.2 °F | 3.18 in. |
| November | 31.6 °F | 50.2 °F | 2.87 in. |
| December | 23.9 °F | 39.4 °F | 2.91 in. |
| Annual | 38.9 °F | 60.3 °F | 40.75 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |