Marshallville, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.9 °F (low) to 59.5 °F (high). Annual precipitation averages 39.8 Inches. Marshallville 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 | 19.1 °F | 33.7 °F | 2.67 in. |
| February | 20.2 °F | 36.6 °F | 1.99 in. |
| March | 28.1 °F | 46.2 °F | 2.9 in. |
| April | 39.0 °F | 59.8 °F | 3.68 in. |
| May | 49.5 °F | 70.2 °F | 4.02 in. |
| June | 58.7 °F | 78.9 °F | 4.24 in. |
| July | 62.2 °F | 82.2 °F | 4.05 in. |
| August | 60.5 °F | 80.9 °F | 3.94 in. |
| September | 53.4 °F | 74.8 °F | 3.54 in. |
| October | 42.5 °F | 62.5 °F | 3.22 in. |
| November | 32.9 °F | 49.7 °F | 2.81 in. |
| December | 25.0 °F | 38.5 °F | 2.69 in. |
| Annual | 40.9 °F | 59.5 °F | 39.75 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 |