Ada, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.7 °C (low) to 22.7 °C (high). Annual precipitation averages 1039.6 Millimeters. Ada 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 | -2.3 °C | 10.8 °C | 49.78 mm |
| February | -0.3 °C | 12.9 °C | 54.36 mm |
| March | 4.4 °C | 17.9 °C | 83.82 mm |
| April | 8.9 °C | 22.4 °C | 101.09 mm |
| May | 14.4 °C | 26.2 °C | 132.33 mm |
| June | 19.5 °C | 30.8 °C | 121.67 mm |
| July | 21.6 °C | 33.9 °C | 91.95 mm |
| August | 20.9 °C | 34.1 °C | 74.42 mm |
| September | 16.6 °C | 30.1 °C | 104.39 mm |
| October | 10 °C | 23.9 °C | 98.04 mm |
| November | 4.1 °C | 17.5 °C | 65.28 mm |
| December | -0.9 °C | 11.7 °C | 62.48 mm |
| Annual | 9.7 °C | 22.7 °C | 1039.61 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |