Highland Lake, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 21.9 °C (high). Annual precipitation averages 1506.5 Millimeters. Highland Lake 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 | -0.1 °C | 10.6 °C | 136.91 mm |
| February | 1.4 °C | 12.9 °C | 143.26 mm |
| March | 5.2 °C | 17.6 °C | 140.21 mm |
| April | 9.3 °C | 22.3 °C | 141.48 mm |
| May | 14.4 °C | 26.2 °C | 124.21 mm |
| June | 18.8 °C | 29.8 °C | 136.14 mm |
| July | 20.7 °C | 31.6 °C | 117.35 mm |
| August | 20.1 °C | 31.2 °C | 102.62 mm |
| September | 16.7 °C | 28.6 °C | 112.52 mm |
| October | 10.2 °C | 23.2 °C | 93.73 mm |
| November | 4.4 °C | 16.7 °C | 116.59 mm |
| December | 1.3 °C | 12.2 °C | 141.48 mm |
| Annual | 10.2 °C | 21.9 °C | 1506.5 mm |
| 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 : -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 |