Richmond, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 18 °C (high). Annual precipitation averages 1079.5 Millimeters. Richmond is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.8 °C | 3 °C | 35.31 mm |
| February | -5.4 °C | 6 °C | 47.24 mm |
| March | -0.1 °C | 12.3 °C | 70.1 mm |
| April | 5.6 °C | 18.3 °C | 107.7 mm |
| May | 11.7 °C | 23.6 °C | 144.53 mm |
| June | 17.2 °C | 28.6 °C | 136.14 mm |
| July | 19.4 °C | 30.8 °C | 121.92 mm |
| August | 18.1 °C | 30.3 °C | 109.73 mm |
| September | 13.2 °C | 26.1 °C | 114.81 mm |
| October | 6.6 °C | 19.7 °C | 91.44 mm |
| November | 0.2 °C | 11.8 °C | 57.15 mm |
| December | -5.1 °C | 5.4 °C | 43.43 mm |
| Annual | 6.1 °C | 18 °C | 1079.5 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |