Cyril, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.2 °F (low) to 72.9 °F (high). Annual precipitation averages 32.8 Inches. Cyril 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 | 27.5 °F | 51.2 °F | 1.18 in. |
| February | 30.7 °F | 54.7 °F | 1.5 in. |
| March | 39.1 °F | 64.0 °F | 2.35 in. |
| April | 47.3 °F | 72.0 °F | 3.4 in. |
| May | 57.7 °F | 80.3 °F | 4.61 in. |
| June | 66.9 °F | 88.9 °F | 4.24 in. |
| July | 70.7 °F | 94.2 °F | 2.73 in. |
| August | 69.7 °F | 94.1 °F | 2.87 in. |
| September | 62.1 °F | 86.1 °F | 3.34 in. |
| October | 49.9 °F | 74.5 °F | 3.21 in. |
| November | 38.7 °F | 62.6 °F | 1.75 in. |
| December | 29.5 °F | 51.9 °F | 1.63 in. |
| Annual | 49.2 °F | 72.9 °F | 32.81 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |