Glenwood, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.2 °C (low) to 25.4 °C (high). Annual precipitation averages 1165.1 Millimeters. 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 | 2.4 °C | 15.8 °C | 109.47 mm |
| February | 4.1 °C | 17.8 °C | 100.84 mm |
| March | 7.1 °C | 21.5 °C | 108.46 mm |
| April | 11.1 °C | 25.6 °C | 80.77 mm |
| May | 15.9 °C | 29.7 °C | 70.36 mm |
| June | 20.3 °C | 32.4 °C | 120.65 mm |
| July | 21.9 °C | 33.7 °C | 112.01 mm |
| August | 21.6 °C | 33.1 °C | 139.95 mm |
| September | 18.7 °C | 30.7 °C | 85.34 mm |
| October | 12.4 °C | 26.2 °C | 64.26 mm |
| November | 6.6 °C | 20.9 °C | 70.87 mm |
| December | 3.7 °C | 16.9 °C | 102.11 mm |
| Annual | 12.2 °C | 25.4 °C | 1165.09 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |