Preston, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.4 °C (low) to 19.3 °C (high). Annual precipitation averages 1135.1 Millimeters. Preston is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 5.6 °C | 50.8 mm |
| February | -3.3 °C | 8.3 °C | 53.59 mm |
| March | 1.4 °C | 14.1 °C | 80.01 mm |
| April | 6.7 °C | 19.8 °C | 125.98 mm |
| May | 12.4 °C | 24.2 °C | 143.76 mm |
| June | 17.3 °C | 28.8 °C | 113.79 mm |
| July | 19.6 °C | 31.2 °C | 112.01 mm |
| August | 18.6 °C | 30.9 °C | 103.89 mm |
| September | 14.1 °C | 26.9 °C | 111.76 mm |
| October | 7.7 °C | 20.8 °C | 92.2 mm |
| November | 2.1 °C | 13.5 °C | 82.8 mm |
| December | -2.9 °C | 7.6 °C | 64.52 mm |
| Annual | 7.4 °C | 19.3 °C | 1135.11 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |