Westwood, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.9 °F (low) to 66.6 °F (high). Annual precipitation averages 44 Inches. Westwood 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 | 24.3 °F | 40.6 °F | 2.71 in. |
| February | 27.4 °F | 45.9 °F | 2.39 in. |
| March | 36.2 °F | 56.3 °F | 3.58 in. |
| April | 46.9 °F | 67.8 °F | 4.7 in. |
| May | 57.5 °F | 76.7 °F | 5.23 in. |
| June | 66.7 °F | 85.2 °F | 4.62 in. |
| July | 70.5 °F | 88.7 °F | 4.06 in. |
| August | 68.5 °F | 87.5 °F | 3.64 in. |
| September | 60.5 °F | 80.9 °F | 3.29 in. |
| October | 49.1 °F | 69.3 °F | 3.45 in. |
| November | 37.6 °F | 55.3 °F | 3.62 in. |
| December | 29.1 °F | 44.7 °F | 2.75 in. |
| Annual | 47.9 °F | 66.6 °F | 44.04 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |