Clinton, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.6 °C (low) to 22.6 °C (high). Annual precipitation averages 777.5 Millimeters. Clinton 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 | -3.6 °C | 9.9 °C | 26.67 mm |
| February | -1.8 °C | 12.1 °C | 30.99 mm |
| March | 2.8 °C | 17.3 °C | 54.61 mm |
| April | 7.4 °C | 22.3 °C | 71.63 mm |
| May | 13.3 °C | 27.1 °C | 107.7 mm |
| June | 18.8 °C | 32.2 °C | 97.28 mm |
| July | 21.2 °C | 35.2 °C | 60.45 mm |
| August | 20.3 °C | 34.7 °C | 95.25 mm |
| September | 16 °C | 29.9 °C | 75.95 mm |
| October | 9 °C | 23.5 °C | 78.49 mm |
| November | 2.3 °C | 16.3 °C | 40.39 mm |
| December | -2.6 °C | 10.5 °C | 38.1 mm |
| Annual | 8.6 °C | 22.6 °C | 777.51 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |