Glenwood, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.9 °F (low) to 77.3 °F (high). Annual precipitation averages 58 Inches. Glenwood is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.1 °F | 59.6 °F | 5.11 in. |
| February | 38.2 °F | 63.9 °F | 4.75 in. |
| March | 44.7 °F | 70.9 °F | 5.54 in. |
| April | 51.0 °F | 77.7 °F | 4.49 in. |
| May | 59.5 °F | 84.8 °F | 3.82 in. |
| June | 67.7 °F | 90.0 °F | 5.53 in. |
| July | 70.6 °F | 91.8 °F | 5.8 in. |
| August | 69.7 °F | 91.2 °F | 5.38 in. |
| September | 65.1 °F | 87.9 °F | 4.35 in. |
| October | 53.4 °F | 79.2 °F | 3.62 in. |
| November | 42.1 °F | 69.1 °F | 4.34 in. |
| December | 37.8 °F | 61.9 °F | 5.24 in. |
| Annual | 52.9 °F | 77.3 °F | 57.97 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |