Preston, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.2 °F (low) to 72.1 °F (high). Annual precipitation averages 42.4 Inches. 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 | 27.4 °F | 50.1 °F | 1.8 in. |
| February | 30.7 °F | 54.0 °F | 2.02 in. |
| March | 39.7 °F | 63.1 °F | 3.17 in. |
| April | 47.8 °F | 71.6 °F | 4.36 in. |
| May | 58.0 °F | 78.8 °F | 5.8 in. |
| June | 66.9 °F | 87.2 °F | 4.55 in. |
| July | 70.7 °F | 92.8 °F | 4.03 in. |
| August | 69.2 °F | 92.9 °F | 3.36 in. |
| September | 61.4 °F | 85.3 °F | 3.83 in. |
| October | 49.5 °F | 74.4 °F | 4.02 in. |
| November | 39.1 °F | 62.7 °F | 3.03 in. |
| December | 30.2 °F | 51.8 °F | 2.41 in. |
| Annual | 49.2 °F | 72.1 °F | 42.38 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |