Fairmont, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47 °F (low) to 71.3 °F (high). Annual precipitation averages 33.5 Inches. Fairmont 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 | 24.4 °F | 47.4 °F | 1.06 in. |
| February | 27.4 °F | 51.4 °F | 1.37 in. |
| March | 36.0 °F | 61.2 °F | 2.45 in. |
| April | 44.6 °F | 70.0 °F | 3.41 in. |
| May | 55.9 °F | 79.3 °F | 4.53 in. |
| June | 65.9 °F | 89.6 °F | 4.56 in. |
| July | 70.2 °F | 94.9 °F | 3.5 in. |
| August | 68.6 °F | 93.5 °F | 3.5 in. |
| September | 60.8 °F | 85.9 °F | 2.81 in. |
| October | 47.9 °F | 73.2 °F | 3.09 in. |
| November | 36.0 °F | 60.1 °F | 1.74 in. |
| December | 26.7 °F | 48.6 °F | 1.49 in. |
| Annual | 47 °F | 71.3 °F | 33.51 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 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |