Ryan, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.8 °F (low) to 75.8 °F (high). Annual precipitation averages 33.4 Inches. Ryan is located in USDA Plant Hardiness Zone 8a. 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 | 29.6 °F | 54.4 °F | 1.5 in. |
| February | 33.1 °F | 58.4 °F | 1.87 in. |
| March | 41.4 °F | 67.2 °F | 2.67 in. |
| April | 49.1 °F | 75.4 °F | 3.05 in. |
| May | 59.5 °F | 83.0 °F | 4.49 in. |
| June | 68.1 °F | 91.1 °F | 3.92 in. |
| July | 71.7 °F | 96.4 °F | 2.29 in. |
| August | 70.8 °F | 96.6 °F | 2.61 in. |
| September | 63.2 °F | 88.5 °F | 3.35 in. |
| October | 51.3 °F | 77.6 °F | 3.47 in. |
| November | 40.2 °F | 65.5 °F | 2.2 in. |
| December | 31.1 °F | 55.5 °F | 1.97 in. |
| Annual | 50.8 °F | 75.8 °F | 33.39 in. |
| 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 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |