Sentinel, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9 °C (low) to 23 °C (high). Annual precipitation averages 736.6 Millimeters. Sentinel 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 | -3.3 °C | 10.5 °C | 24.89 mm |
| February | -1.6 °C | 12.7 °C | 29.21 mm |
| March | 3.1 °C | 17.7 °C | 52.32 mm |
| April | 7.7 °C | 22.4 °C | 74.17 mm |
| May | 13.8 °C | 27.4 °C | 107.7 mm |
| June | 19.2 °C | 32.6 °C | 93.22 mm |
| July | 21.4 °C | 35.4 °C | 60.2 mm |
| August | 20.7 °C | 34.9 °C | 83.06 mm |
| September | 16.4 °C | 30.3 °C | 68.83 mm |
| October | 9.4 °C | 23.8 °C | 70.36 mm |
| November | 2.8 °C | 16.8 °C | 39.62 mm |
| December | -2.2 °C | 10.9 °C | 33.02 mm |
| Annual | 9 °C | 23 °C | 736.6 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 | Exceptional Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |