Rayville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 63.8 °F (high). Annual precipitation averages 41.9 Inches. 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 | 17.7 °F | 36.6 °F | 1.33 in. |
| February | 21.7 °F | 41.9 °F | 1.82 in. |
| March | 31.7 °F | 53.6 °F | 2.75 in. |
| April | 41.9 °F | 64.1 °F | 4.13 in. |
| May | 53.1 °F | 73.6 °F | 5.63 in. |
| June | 62.8 °F | 83.0 °F | 5.11 in. |
| July | 67.0 °F | 87.3 °F | 4.87 in. |
| August | 64.8 °F | 86.1 °F | 4.4 in. |
| September | 55.6 °F | 78.6 °F | 4.48 in. |
| October | 44.0 °F | 66.8 °F | 3.53 in. |
| November | 32.3 °F | 52.7 °F | 2.17 in. |
| December | 22.6 °F | 40.7 °F | 1.72 in. |
| Annual | 42.9 °F | 63.8 °F | 41.94 in. |
| 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 : -10°F to -5°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 |