Lamar Heights, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.3 °F (low) to 67.5 °F (high). Annual precipitation averages 46.8 Inches. Lamar Heights is located in USDA Plant Hardiness Zone 7a. 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 | 23.3 °F | 42.9 °F | 1.82 in. |
| February | 27.0 °F | 48.0 °F | 2.14 in. |
| March | 35.5 °F | 57.9 °F | 3.27 in. |
| April | 45.0 °F | 67.5 °F | 4.81 in. |
| May | 55.5 °F | 75.8 °F | 6.89 in. |
| June | 64.7 °F | 84.6 °F | 6.05 in. |
| July | 68.9 °F | 89.3 °F | 4.41 in. |
| August | 67.0 °F | 89.0 °F | 3.36 in. |
| September | 58.5 °F | 81.2 °F | 4.65 in. |
| October | 46.7 °F | 70.2 °F | 3.61 in. |
| November | 35.9 °F | 57.2 °F | 3.21 in. |
| December | 27.0 °F | 46.3 °F | 2.6 in. |
| Annual | 46.3 °F | 67.5 °F | 46.82 in. |
| 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |