Oologah, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 21.4 °C (high). Annual precipitation averages 1079.2 Millimeters. Oologah 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 | -3.9 °C | 8.4 °C | 44.96 mm |
| February | -2 °C | 11.2 °C | 50.04 mm |
| March | 2.8 °C | 16.2 °C | 83.31 mm |
| April | 8 °C | 21.4 °C | 108.2 mm |
| May | 13.8 °C | 25.6 °C | 151.13 mm |
| June | 19 °C | 30.3 °C | 120.14 mm |
| July | 21.2 °C | 33.3 °C | 96.77 mm |
| August | 20.3 °C | 33.3 °C | 92.46 mm |
| September | 15.5 °C | 29 °C | 103.89 mm |
| October | 8.8 °C | 22.8 °C | 92.96 mm |
| November | 2.7 °C | 15.9 °C | 77.98 mm |
| December | -2.1 °C | 9.8 °C | 57.4 mm |
| Annual | 8.7 °C | 21.4 °C | 1079.24 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |