County Line, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.7 °F (low) to 73.7 °F (high). Annual precipitation averages 58.4 Inches. County Line is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.2 °F | 53.6 °F | 5.38 in. |
| February | 33.8 °F | 57.8 °F | 5.23 in. |
| March | 40.6 °F | 66.2 °F | 5.65 in. |
| April | 47.6 °F | 74.7 °F | 5.54 in. |
| May | 57.0 °F | 81.4 °F | 4.79 in. |
| June | 65.1 °F | 87.6 °F | 4.07 in. |
| July | 68.6 °F | 90.6 °F | 4.72 in. |
| August | 67.9 °F | 90.3 °F | 4.32 in. |
| September | 61.9 °F | 85.6 °F | 4.46 in. |
| October | 49.3 °F | 75.6 °F | 3.45 in. |
| November | 38.9 °F | 64.5 °F | 4.59 in. |
| December | 34.3 °F | 56.0 °F | 6.22 in. |
| Annual | 49.7 °F | 73.7 °F | 58.42 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |