Hazelwood, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 47.9 °F (low) to 66.4 °F (high). Annual precipitation averages 43 Inches. Hazelwood 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.2 °F | 40.0 °F | 2.64 in. |
| February | 27.1 °F | 45.8 °F | 2.17 in. |
| March | 36.2 °F | 56.0 °F | 3.46 in. |
| April | 47.0 °F | 67.4 °F | 4.88 in. |
| May | 57.7 °F | 76.4 °F | 5.06 in. |
| June | 66.9 °F | 85.1 °F | 4.63 in. |
| July | 70.7 °F | 88.5 °F | 3.92 in. |
| August | 68.8 °F | 87.4 °F | 3.56 in. |
| September | 60.5 °F | 80.6 °F | 3.17 in. |
| October | 48.9 °F | 69.2 °F | 3.27 in. |
| November | 37.4 °F | 55.3 °F | 3.51 in. |
| December | 28.8 °F | 44.6 °F | 2.72 in. |
| Annual | 47.9 °F | 66.4 °F | 42.99 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |