Hammon, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.3 °F (low) to 72.5 °F (high). Annual precipitation averages 27.7 Inches. Hammon 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 | 24.1 °F | 50.0 °F | 0.91 in. |
| February | 26.9 °F | 53.6 °F | 0.99 in. |
| March | 35.5 °F | 63.2 °F | 2.02 in. |
| April | 44.3 °F | 72.0 °F | 2.65 in. |
| May | 55.1 °F | 80.5 °F | 3.92 in. |
| June | 65.2 °F | 89.4 °F | 3.65 in. |
| July | 69.4 °F | 95.0 °F | 2.28 in. |
| August | 67.9 °F | 93.9 °F | 3.28 in. |
| September | 60.0 °F | 85.9 °F | 2.63 in. |
| October | 46.8 °F | 74.0 °F | 2.55 in. |
| November | 34.7 °F | 61.5 °F | 1.47 in. |
| December | 25.6 °F | 50.8 °F | 1.35 in. |
| Annual | 46.3 °F | 72.5 °F | 27.7 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |