Riverside, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.9 °F (low) to 65.4 °F (high). Annual precipitation averages 41.8 Inches. Riverside is located in USDA Plant Hardiness Zone 6b. 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 | 19.8 °F | 38.6 °F | 1.4 in. |
| February | 23.8 °F | 44.2 °F | 1.67 in. |
| March | 33.5 °F | 55.3 °F | 2.44 in. |
| April | 43.9 °F | 65.9 °F | 3.99 in. |
| May | 54.9 °F | 75.1 °F | 5.52 in. |
| June | 64.8 °F | 84.4 °F | 5.46 in. |
| July | 69.1 °F | 88.8 °F | 4.64 in. |
| August | 66.8 °F | 87.5 °F | 4.6 in. |
| September | 57.9 °F | 79.9 °F | 4.42 in. |
| October | 45.8 °F | 68.1 °F | 3.53 in. |
| November | 34.2 °F | 54.1 °F | 2.33 in. |
| December | 24.6 °F | 42.7 °F | 1.81 in. |
| Annual | 44.9 °F | 65.4 °F | 41.81 in. |
| 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |