Alamo, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.2 °C (low) to 25.3 °C (high). Annual precipitation averages 1183.1 Millimeters. Alamo 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.4 °C | 15.7 °C | 109.73 mm |
| February | 4 °C | 17.7 °C | 101.6 mm |
| March | 7.2 °C | 21.4 °C | 109.98 mm |
| April | 11.3 °C | 25.4 °C | 82.8 mm |
| May | 16.1 °C | 29.6 °C | 71.12 mm |
| June | 20.4 °C | 32.3 °C | 121.92 mm |
| July | 21.9 °C | 33.6 °C | 115.57 mm |
| August | 21.7 °C | 33.1 °C | 138.68 mm |
| September | 18.7 °C | 30.6 °C | 92.2 mm |
| October | 12.4 °C | 26.1 °C | 67.31 mm |
| November | 6.6 °C | 20.9 °C | 70.87 mm |
| December | 3.8 °C | 16.9 °C | 101.35 mm |
| Annual | 12.2 °C | 25.3 °C | 1183.13 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 |