Fairfield, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.8 °F (low) to 68.2 °F (high). Annual precipitation averages 52.7 Inches. Fairfield 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 | 27.3 °F | 45.0 °F | 4.05 in. |
| February | 30.2 °F | 49.7 °F | 4.5 in. |
| March | 37.6 °F | 58.7 °F | 4.97 in. |
| April | 46.4 °F | 69.3 °F | 4.77 in. |
| May | 56.7 °F | 77.0 °F | 5.45 in. |
| June | 64.6 °F | 84.5 °F | 4.49 in. |
| July | 68.1 °F | 87.7 °F | 4.67 in. |
| August | 66.8 °F | 87.2 °F | 3.83 in. |
| September | 59.5 °F | 81.6 °F | 3.82 in. |
| October | 47.9 °F | 70.9 °F | 3.57 in. |
| November | 37.4 °F | 58.3 °F | 3.75 in. |
| December | 31.4 °F | 48.6 °F | 4.78 in. |
| Annual | 47.8 °F | 68.2 °F | 52.65 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |