Chesterfield, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 46 °F (low) to 66.2 °F (high). Annual precipitation averages 43.1 Inches. Chesterfield is located in USDA Plant Hardiness Zone 6b. 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 | 22.2 °F | 39.6 °F | 2.6 in. |
| February | 25.8 °F | 45.3 °F | 2.4 in. |
| March | 34.6 °F | 55.4 °F | 3.54 in. |
| April | 45.4 °F | 67.4 °F | 4.67 in. |
| May | 56.2 °F | 76.4 °F | 5.04 in. |
| June | 65.2 °F | 84.8 °F | 4.52 in. |
| July | 69.0 °F | 88.5 °F | 3.89 in. |
| August | 66.9 °F | 87.3 °F | 3.56 in. |
| September | 58.5 °F | 80.7 °F | 3.17 in. |
| October | 46.5 °F | 68.9 °F | 3.45 in. |
| November | 35.5 °F | 55.4 °F | 3.56 in. |
| December | 26.7 °F | 44.3 °F | 2.74 in. |
| Annual | 46 °F | 66.2 °F | 43.14 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |