Jefferson, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.3 °F (low) to 71.5 °F (high). Annual precipitation averages 33.7 Inches. Jefferson 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.1 °F | 47.3 °F | 1.05 in. |
| February | 26.4 °F | 51.7 °F | 1.28 in. |
| March | 35.2 °F | 61.4 °F | 2.47 in. |
| April | 44.0 °F | 70.9 °F | 3.48 in. |
| May | 55.3 °F | 79.7 °F | 4.31 in. |
| June | 65.5 °F | 89.9 °F | 4.7 in. |
| July | 69.9 °F | 94.9 °F | 3.61 in. |
| August | 68.1 °F | 93.4 °F | 3.71 in. |
| September | 59.9 °F | 86.1 °F | 2.57 in. |
| October | 46.9 °F | 73.6 °F | 3.29 in. |
| November | 35.0 °F | 60.4 °F | 1.74 in. |
| December | 25.7 °F | 48.7 °F | 1.47 in. |
| Annual | 46.3 °F | 71.5 °F | 33.68 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |