Zena, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.6 °F (low) to 70.3 °F (high). Annual precipitation averages 47.7 Inches. Zena 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 | 25.8 °F | 47.5 °F | 2.55 in. |
| February | 29.3 °F | 52.1 °F | 2.34 in. |
| March | 37.7 °F | 61.3 °F | 3.91 in. |
| April | 46.4 °F | 70.5 °F | 4.84 in. |
| May | 56.2 °F | 77.8 °F | 6.41 in. |
| June | 65.2 °F | 85.9 °F | 4.86 in. |
| July | 69.2 °F | 91.3 °F | 4.13 in. |
| August | 67.5 °F | 91.1 °F | 3.64 in. |
| September | 59.6 °F | 83.5 °F | 4.55 in. |
| October | 48.0 °F | 72.4 °F | 4.21 in. |
| November | 37.7 °F | 60.5 °F | 3.46 in. |
| December | 29.1 °F | 50.1 °F | 2.83 in. |
| Annual | 47.6 °F | 70.3 °F | 47.73 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |