Valley Park, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8 °C (low) to 19.1 °C (high). Annual precipitation averages 1133.6 Millimeters. Valley Park 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 | -5.2 °C | 4.3 °C | 72.64 mm |
| February | -3.2 °C | 7.5 °C | 62.23 mm |
| March | 1.7 °C | 12.9 °C | 92.96 mm |
| April | 7.6 °C | 20.1 °C | 121.16 mm |
| May | 13.6 °C | 24.9 °C | 138.94 mm |
| June | 18.6 °C | 29.6 °C | 118.11 mm |
| July | 20.7 °C | 31.6 °C | 104.39 mm |
| August | 19.6 °C | 30.8 °C | 89.41 mm |
| September | 14.9 °C | 27.2 °C | 85.85 mm |
| October | 8.3 °C | 20.7 °C | 84.33 mm |
| November | 2.2 °C | 13.1 °C | 93.22 mm |
| December | -2.8 °C | 6.9 °C | 70.36 mm |
| Annual | 8 °C | 19.1 °C | 1133.6 mm |
| 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |