Rayville, 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 17.6 °C (high). Annual precipitation averages 1065.3 Millimeters. Rayville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 2.6 °C | 33.78 mm |
| February | -5.7 °C | 5.5 °C | 46.23 mm |
| March | -0.2 °C | 12 °C | 69.85 mm |
| April | 5.5 °C | 17.8 °C | 104.9 mm |
| May | 11.7 °C | 23.1 °C | 143 mm |
| June | 17.1 °C | 28.3 °C | 129.79 mm |
| July | 19.4 °C | 30.7 °C | 123.7 mm |
| August | 18.2 °C | 30.1 °C | 111.76 mm |
| September | 13.1 °C | 25.9 °C | 113.79 mm |
| October | 6.7 °C | 19.3 °C | 89.66 mm |
| November | 0.2 °C | 11.5 °C | 55.12 mm |
| December | -5.2 °C | 4.8 °C | 43.69 mm |
| Annual | 6.1 °C | 17.6 °C | 1065.27 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |