Custer City, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.5 °F (low) to 71.7 °F (high). Annual precipitation averages 29.8 Inches. Custer City 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.5 °F | 49.1 °F | 0.96 in. |
| February | 28.3 °F | 52.4 °F | 1.22 in. |
| March | 36.7 °F | 62.1 °F | 2.22 in. |
| April | 45.0 °F | 70.6 °F | 2.93 in. |
| May | 55.9 °F | 79.7 °F | 4.1 in. |
| June | 65.8 °F | 89.2 °F | 3.84 in. |
| July | 70.2 °F | 94.6 °F | 2.44 in. |
| August | 68.7 °F | 93.6 °F | 3.5 in. |
| September | 61.2 °F | 85.4 °F | 2.78 in. |
| October | 48.3 °F | 73.0 °F | 2.93 in. |
| November | 36.5 °F | 60.6 °F | 1.52 in. |
| December | 27.4 °F | 49.7 °F | 1.39 in. |
| Annual | 47.5 °F | 71.7 °F | 29.83 in. |
| 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |