Oktaha, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.9 °C (low) to 22.1 °C (high). Annual precipitation averages 1117.4 Millimeters. Oktaha is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.4 °C | 9.7 °C | 59.94 mm |
| February | -0.4 °C | 12.1 °C | 53.09 mm |
| March | 4.3 °C | 17.1 °C | 90.93 mm |
| April | 9.1 °C | 21.9 °C | 104.65 mm |
| May | 14.7 °C | 25.9 °C | 148.59 mm |
| June | 19.8 °C | 30.7 °C | 116.84 mm |
| July | 21.9 °C | 33.6 °C | 89.41 mm |
| August | 21.3 °C | 33.7 °C | 79.76 mm |
| September | 16.7 °C | 29.6 °C | 119.38 mm |
| October | 9.9 °C | 23.3 °C | 94.74 mm |
| November | 4.2 °C | 17 °C | 89.92 mm |
| December | -0.8 °C | 10.9 °C | 70.1 mm |
| Annual | 9.9 °C | 22.1 °C | 1117.35 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |