Richmond, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.8 °C (low) to 16.5 °C (high). Annual precipitation averages 1067.8 Millimeters. Richmond is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 2.7 °C | 82.04 mm |
| February | -5.2 °C | 4.3 °C | 62.23 mm |
| March | -1 °C | 9.7 °C | 84.58 mm |
| April | 4.8 °C | 17.2 °C | 94.23 mm |
| May | 10.4 °C | 22.3 °C | 102.87 mm |
| June | 15.2 °C | 26.5 °C | 115.82 mm |
| July | 17.3 °C | 28.4 °C | 107.44 mm |
| August | 16.5 °C | 28.1 °C | 93.47 mm |
| September | 12.8 °C | 24.7 °C | 92.96 mm |
| October | 6.7 °C | 18 °C | 78.49 mm |
| November | 1.3 °C | 11.1 °C | 74.68 mm |
| December | -2.9 °C | 5.1 °C | 78.99 mm |
| Annual | 5.8 °C | 16.5 °C | 1067.8 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |