Ritchey, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.2 °F (low) to 68.1 °F (high). Annual precipitation averages 47.6 Inches. Ritchey is located in USDA Plant Hardiness Zone 7a. 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 | 24.0 °F | 44.5 °F | 2.34 in. |
| February | 27.2 °F | 49.0 °F | 2.24 in. |
| March | 35.9 °F | 58.6 °F | 3.8 in. |
| April | 45.1 °F | 68.1 °F | 5.06 in. |
| May | 55.1 °F | 75.9 °F | 6.37 in. |
| June | 64.1 °F | 84.5 °F | 5.04 in. |
| July | 68.3 °F | 89.4 °F | 3.91 in. |
| August | 66.5 °F | 89.1 °F | 3.61 in. |
| September | 58.1 °F | 81.7 °F | 4.66 in. |
| October | 46.4 °F | 70.6 °F | 4.02 in. |
| November | 36.0 °F | 58.1 °F | 3.73 in. |
| December | 27.4 °F | 47.9 °F | 2.85 in. |
| Annual | 46.2 °F | 68.1 °F | 47.63 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |