Richland, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.5 °C (low) to 19 °C (high). Annual precipitation averages 1148.1 Millimeters. Richland is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.1 °C | 5.2 °C | 63.75 mm |
| February | -2.9 °C | 8.2 °C | 60.71 mm |
| March | 1.4 °C | 13.5 °C | 93.47 mm |
| April | 7.1 °C | 19.6 °C | 118.87 mm |
| May | 12.7 °C | 24 °C | 137.67 mm |
| June | 17.4 °C | 28.4 °C | 113.03 mm |
| July | 19.7 °C | 30.9 °C | 104.65 mm |
| August | 18.7 °C | 30.6 °C | 102.62 mm |
| September | 13.9 °C | 26.4 °C | 107.44 mm |
| October | 7.7 °C | 20.3 °C | 86.61 mm |
| November | 2.1 °C | 13.2 °C | 90.68 mm |
| December | -2.7 °C | 7.3 °C | 68.58 mm |
| Annual | 7.5 °C | 19 °C | 1148.08 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 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 |