Pevely, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.2 °C (low) to 19.3 °C (high). Annual precipitation averages 1105.9 Millimeters. Pevely 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 | -4.9 °C | 4.8 °C | 69.6 mm |
| February | -2.8 °C | 7.8 °C | 62.74 mm |
| March | 1.9 °C | 13.3 °C | 99.06 mm |
| April | 7.8 °C | 19.9 °C | 126.49 mm |
| May | 13.7 °C | 24.9 °C | 122.43 mm |
| June | 18.6 °C | 29.7 °C | 109.73 mm |
| July | 20.8 °C | 31.7 °C | 102.62 mm |
| August | 19.6 °C | 30.9 °C | 89.92 mm |
| September | 15.1 °C | 27.3 °C | 86.36 mm |
| October | 8.7 °C | 20.8 °C | 76.96 mm |
| November | 2.5 °C | 13.3 °C | 87.38 mm |
| December | -2.4 °C | 7.1 °C | 72.64 mm |
| Annual | 8.2 °C | 19.3 °C | 1105.93 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |