Clarkson Valley, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8.5 °C (low) to 19.1 °C (high). Annual precipitation averages 1106.9 Millimeters. Clarkson Valley 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 | -4.4 °C | 4.7 °C | 68.58 mm |
| February | -2.8 °C | 7.6 °C | 62.74 mm |
| March | 2.2 °C | 13.4 °C | 91.69 mm |
| April | 8 °C | 19.7 °C | 120.4 mm |
| May | 13.8 °C | 24.6 °C | 130.05 mm |
| June | 18.9 °C | 29.3 °C | 115.82 mm |
| July | 21.1 °C | 31.3 °C | 98.81 mm |
| August | 20 °C | 30.7 °C | 89.92 mm |
| September | 15.6 °C | 27.1 °C | 81.28 mm |
| October | 8.9 °C | 20.5 °C | 86.36 mm |
| November | 2.9 °C | 13 °C | 91.19 mm |
| December | -1.9 °C | 6.9 °C | 70.1 mm |
| Annual | 8.5 °C | 19.1 °C | 1106.94 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 7a : -17.8°C to -15°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 |