Weldon Spring, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.9 °C (low) to 19 °C (high). Annual precipitation averages 1106.7 Millimeters. Weldon Spring 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 | -5.1 °C | 4.4 °C | 66.8 mm |
| February | -3.5 °C | 7.6 °C | 61.98 mm |
| March | 1.6 °C | 13.3 °C | 91.69 mm |
| April | 7.5 °C | 19.7 °C | 122.43 mm |
| May | 13.3 °C | 24.6 °C | 128.78 mm |
| June | 18.4 °C | 29.2 °C | 116.08 mm |
| July | 20.4 °C | 31.3 °C | 98.55 mm |
| August | 19.4 °C | 30.7 °C | 91.19 mm |
| September | 14.7 °C | 27 °C | 82.3 mm |
| October | 8.1 °C | 20.5 °C | 85.09 mm |
| November | 2.2 °C | 13.1 °C | 90.42 mm |
| December | -2.6 °C | 6.9 °C | 71.37 mm |
| Annual | 7.9 °C | 19 °C | 1106.68 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |