Fairfield, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.4 °F (low) to 77.8 °F (high). Annual precipitation averages 44.2 Inches. Fairfield is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.0 °F | 58.8 °F | 3.33 in. |
| February | 40.5 °F | 63.0 °F | 3.41 in. |
| March | 47.1 °F | 69.7 °F | 3.91 in. |
| April | 54.0 °F | 77.3 °F | 3.74 in. |
| May | 63.1 °F | 83.8 °F | 4.61 in. |
| June | 70.6 °F | 91.0 °F | 4.19 in. |
| July | 73.0 °F | 94.8 °F | 2.03 in. |
| August | 72.4 °F | 96.1 °F | 2.78 in. |
| September | 66.2 °F | 89.7 °F | 3.76 in. |
| October | 55.8 °F | 80.1 °F | 4.66 in. |
| November | 46.1 °F | 68.7 °F | 3.81 in. |
| December | 38.4 °F | 60.4 °F | 3.95 in. |
| Annual | 55.4 °F | 77.8 °F | 44.18 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |