Preston, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 22.3 °C (high). Annual precipitation averages 1076.4 Millimeters. Preston is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.6 °C | 10.1 °C | 45.72 mm |
| February | -0.7 °C | 12.2 °C | 51.31 mm |
| March | 4.3 °C | 17.3 °C | 80.52 mm |
| April | 8.8 °C | 22 °C | 110.74 mm |
| May | 14.4 °C | 26 °C | 147.32 mm |
| June | 19.4 °C | 30.7 °C | 115.57 mm |
| July | 21.5 °C | 33.8 °C | 102.36 mm |
| August | 20.7 °C | 33.8 °C | 85.34 mm |
| September | 16.3 °C | 29.6 °C | 97.28 mm |
| October | 9.7 °C | 23.6 °C | 102.11 mm |
| November | 3.9 °C | 17.1 °C | 76.96 mm |
| December | -1 °C | 11 °C | 61.21 mm |
| Annual | 9.6 °C | 22.3 °C | 1076.44 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |