Graysville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.9 °F (low) to 62.7 °F (high). Annual precipitation averages 45 Inches. Graysville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.1 °F | 37.9 °F | 3.4 in. |
| February | 23.0 °F | 41.3 °F | 2.91 in. |
| March | 29.9 °F | 50.7 °F | 3.81 in. |
| April | 40.2 °F | 64.0 °F | 3.92 in. |
| May | 50.0 °F | 72.7 °F | 4.53 in. |
| June | 58.7 °F | 80.7 °F | 4.75 in. |
| July | 63.2 °F | 84.1 °F | 4.61 in. |
| August | 60.8 °F | 83.1 °F | 3.81 in. |
| September | 53.9 °F | 77.5 °F | 3.6 in. |
| October | 42.4 °F | 65.3 °F | 3.07 in. |
| November | 33.2 °F | 53.0 °F | 3.15 in. |
| December | 26.6 °F | 42.4 °F | 3.41 in. |
| Annual | 41.9 °F | 62.7 °F | 44.97 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |