Preston, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.3 °F (low) to 66.8 °F (high). Annual precipitation averages 44.7 Inches. 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 | 22.6 °F | 42.0 °F | 2.0 in. |
| February | 26.1 °F | 47.0 °F | 2.11 in. |
| March | 34.6 °F | 57.3 °F | 3.15 in. |
| April | 44.1 °F | 67.7 °F | 4.96 in. |
| May | 54.3 °F | 75.6 °F | 5.66 in. |
| June | 63.1 °F | 83.8 °F | 4.48 in. |
| July | 67.3 °F | 88.2 °F | 4.41 in. |
| August | 65.5 °F | 87.7 °F | 4.09 in. |
| September | 57.4 °F | 80.5 °F | 4.4 in. |
| October | 45.9 °F | 69.5 °F | 3.63 in. |
| November | 35.8 °F | 56.3 °F | 3.26 in. |
| December | 26.7 °F | 45.6 °F | 2.54 in. |
| Annual | 45.3 °F | 66.8 °F | 44.69 in. |
| 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 : -5°F to 0°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 |