Waterloo, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.2 °F (low) to 72 °F (high). Annual precipitation averages 58.5 Inches. Waterloo 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.8 °F | 50.4 °F | 5.19 in. |
| February | 33.0 °F | 55.2 °F | 5.13 in. |
| March | 39.8 °F | 63.5 °F | 5.59 in. |
| April | 48.2 °F | 73.0 °F | 5.42 in. |
| May | 57.5 °F | 80.1 °F | 5.22 in. |
| June | 65.6 °F | 87.0 °F | 4.44 in. |
| July | 68.6 °F | 90.1 °F | 5.22 in. |
| August | 67.4 °F | 89.3 °F | 4.47 in. |
| September | 60.9 °F | 84.8 °F | 4.23 in. |
| October | 48.5 °F | 74.6 °F | 3.68 in. |
| November | 37.7 °F | 62.6 °F | 3.98 in. |
| December | 32.9 °F | 53.0 °F | 5.93 in. |
| Annual | 49.2 °F | 72 °F | 58.5 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |