Opelika, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.1 °C (low) to 23.4 °C (high). Annual precipitation averages 1398.5 Millimeters. Opelika 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 | 0.8 °C | 13.3 °C | 130.81 mm |
| February | 2.7 °C | 15.5 °C | 130.81 mm |
| March | 6.1 °C | 19.8 °C | 140.21 mm |
| April | 10 °C | 23.4 °C | 118.62 mm |
| May | 15.2 °C | 27.4 °C | 95 mm |
| June | 19.2 °C | 30.7 °C | 121.92 mm |
| July | 20.9 °C | 32.1 °C | 134.62 mm |
| August | 20.7 °C | 31.6 °C | 105.92 mm |
| September | 17.8 °C | 29.2 °C | 93.22 mm |
| October | 11.4 °C | 24.2 °C | 82.04 mm |
| November | 5.5 °C | 18.9 °C | 105.41 mm |
| December | 2.6 °C | 14.5 °C | 139.95 mm |
| Annual | 11.1 °C | 23.4 °C | 1398.53 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |