Lawson, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 63.7 °F (high). Annual precipitation averages 41.1 Inches. Lawson is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.6 °F | 36.5 °F | 1.22 in. |
| February | 21.5 °F | 41.8 °F | 1.66 in. |
| March | 31.7 °F | 53.9 °F | 2.52 in. |
| April | 42.0 °F | 64.0 °F | 3.88 in. |
| May | 53.4 °F | 73.3 °F | 5.71 in. |
| June | 62.6 °F | 82.9 °F | 5.13 in. |
| July | 66.9 °F | 87.4 °F | 4.94 in. |
| August | 65.2 °F | 86.1 °F | 4.32 in. |
| September | 55.6 °F | 78.6 °F | 4.47 in. |
| October | 44.0 °F | 66.7 °F | 3.37 in. |
| November | 32.2 °F | 52.6 °F | 2.12 in. |
| December | 22.4 °F | 40.5 °F | 1.71 in. |
| Annual | 42.9 °F | 63.7 °F | 41.05 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |