Chesterfield, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.8 °C (low) to 19 °C (high). Annual precipitation averages 1095.8 Millimeters. 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 | -5.4 °C | 4.2 °C | 66.04 mm |
| February | -3.4 °C | 7.4 °C | 60.96 mm |
| March | 1.4 °C | 13 °C | 89.92 mm |
| April | 7.4 °C | 19.7 °C | 118.62 mm |
| May | 13.4 °C | 24.7 °C | 128.02 mm |
| June | 18.4 °C | 29.3 °C | 114.81 mm |
| July | 20.6 °C | 31.4 °C | 98.81 mm |
| August | 19.4 °C | 30.7 °C | 90.42 mm |
| September | 14.7 °C | 27.1 °C | 80.52 mm |
| October | 8.1 °C | 20.5 °C | 87.63 mm |
| November | 1.9 °C | 13 °C | 90.42 mm |
| December | -2.9 °C | 6.8 °C | 69.6 mm |
| Annual | 7.8 °C | 19 °C | 1095.77 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |