Cardiff, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 23.7 °C (high). Annual precipitation averages 1485.9 Millimeters. Cardiff 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 | -0.1 °C | 12.6 °C | 137.92 mm |
| February | 1.5 °C | 14.9 °C | 137.16 mm |
| March | 5.3 °C | 19.6 °C | 147.57 mm |
| April | 9.2 °C | 24.2 °C | 132.08 mm |
| May | 14.3 °C | 27.9 °C | 116.84 mm |
| June | 18.7 °C | 31.3 °C | 122.43 mm |
| July | 20.6 °C | 33 °C | 128.02 mm |
| August | 20.2 °C | 32.8 °C | 105.41 mm |
| September | 16.8 °C | 30.3 °C | 114.55 mm |
| October | 10.1 °C | 24.7 °C | 87.63 mm |
| November | 4.3 °C | 18.6 °C | 119.38 mm |
| December | 1.6 °C | 13.9 °C | 136.91 mm |
| Annual | 10.2 °C | 23.7 °C | 1485.9 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |