La Grange, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.5 °F (low) to 63 °F (high). Annual precipitation averages 39.6 Inches. 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 | 18.2 °F | 34.9 °F | 1.74 in. |
| February | 21.8 °F | 39.6 °F | 1.96 in. |
| March | 31.4 °F | 51.4 °F | 2.54 in. |
| April | 42.5 °F | 64.1 °F | 4.05 in. |
| May | 53.8 °F | 73.9 °F | 5.1 in. |
| June | 63.6 °F | 83.0 °F | 4.75 in. |
| July | 66.9 °F | 86.9 °F | 4.0 in. |
| August | 64.9 °F | 85.3 °F | 3.97 in. |
| September | 56.6 °F | 78.8 °F | 3.59 in. |
| October | 44.9 °F | 66.4 °F | 3.29 in. |
| November | 33.3 °F | 52.1 °F | 2.66 in. |
| December | 23.5 °F | 39.6 °F | 1.96 in. |
| Annual | 43.5 °F | 63 °F | 39.61 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |