Weston, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.2 °C (low) to 18.2 °C (high). Annual precipitation averages 998.7 Millimeters. Weston is located in USDA Plant Hardiness Zone 6a. 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 | -7.9 °C | 2.9 °C | 27.18 mm |
| February | -5.8 °C | 5.9 °C | 37.34 mm |
| March | -0.2 °C | 12.6 °C | 59.44 mm |
| April | 5.6 °C | 18.4 °C | 99.57 mm |
| May | 11.9 °C | 23.6 °C | 133.35 mm |
| June | 17.6 °C | 28.9 °C | 133.1 mm |
| July | 19.7 °C | 31.3 °C | 113.28 mm |
| August | 18.6 °C | 30.6 °C | 111.51 mm |
| September | 13.6 °C | 26.4 °C | 100.33 mm |
| October | 6.5 °C | 19.8 °C | 89.15 mm |
| November | -0.1 °C | 12.1 °C | 54.1 mm |
| December | -5.3 °C | 5.4 °C | 40.39 mm |
| Annual | 6.2 °C | 18.2 °C | 998.74 mm |
| 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 6a : -23.3°C to -20.6°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 |