Washington Court House, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.4 °F (low) to 62.1 °F (high). Annual precipitation averages 41.4 Inches. Washington Court House is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.9 °F | 36.6 °F | 2.99 in. |
| February | 22.8 °F | 39.9 °F | 2.58 in. |
| March | 30.7 °F | 50.1 °F | 3.77 in. |
| April | 40.9 °F | 62.7 °F | 4.22 in. |
| May | 52.0 °F | 72.8 °F | 4.55 in. |
| June | 60.9 °F | 80.9 °F | 4.28 in. |
| July | 63.6 °F | 83.3 °F | 4.05 in. |
| August | 61.6 °F | 82.6 °F | 3.34 in. |
| September | 53.9 °F | 77.7 °F | 2.72 in. |
| October | 43.0 °F | 65.7 °F | 2.95 in. |
| November | 32.9 °F | 52.0 °F | 2.93 in. |
| December | 26.1 °F | 40.9 °F | 2.97 in. |
| Annual | 42.4 °F | 62.1 °F | 41.35 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |