La Grange, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 17.2 °C (high). Annual precipitation averages 1006.1 Millimeters. La Grange is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | 1.6 °C | 44.2 mm |
| February | -5.7 °C | 4.2 °C | 49.78 mm |
| March | -0.3 °C | 10.8 °C | 64.52 mm |
| April | 5.8 °C | 17.8 °C | 102.87 mm |
| May | 12.1 °C | 23.3 °C | 129.54 mm |
| June | 17.6 °C | 28.3 °C | 120.65 mm |
| July | 19.4 °C | 30.5 °C | 101.6 mm |
| August | 18.3 °C | 29.6 °C | 100.84 mm |
| September | 13.7 °C | 26 °C | 91.19 mm |
| October | 7.2 °C | 19.1 °C | 83.57 mm |
| November | 0.7 °C | 11.2 °C | 67.56 mm |
| December | -4.7 °C | 4.2 °C | 49.78 mm |
| Annual | 6.4 °C | 17.2 °C | 1006.1 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |