Isabella, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.4 °F (low) to 72.1 °F (high). Annual precipitation averages 31 Inches. Isabella is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.9 °F | 48.5 °F | 0.89 in. |
| February | 27.8 °F | 52.4 °F | 1.3 in. |
| March | 36.5 °F | 62.3 °F | 2.26 in. |
| April | 44.9 °F | 71.5 °F | 3.08 in. |
| May | 55.9 °F | 80.5 °F | 4.14 in. |
| June | 66.1 °F | 90.4 °F | 4.27 in. |
| July | 70.6 °F | 95.7 °F | 3.16 in. |
| August | 69.0 °F | 94.2 °F | 3.47 in. |
| September | 61.0 °F | 86.3 °F | 2.53 in. |
| October | 48.4 °F | 73.9 °F | 2.92 in. |
| November | 36.3 °F | 60.5 °F | 1.62 in. |
| December | 27.0 °F | 49.4 °F | 1.4 in. |
| Annual | 47.4 °F | 72.1 °F | 31.04 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |