Manassas, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.8 °F (low) to 77.6 °F (high). Annual precipitation averages 48.2 Inches. Manassas is located in USDA Plant Hardiness Zone 9a. 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 | 37.3 °F | 60.7 °F | 3.9 in. |
| February | 40.0 °F | 64.2 °F | 3.77 in. |
| March | 45.8 °F | 71.0 °F | 3.83 in. |
| April | 52.9 °F | 78.1 °F | 3.44 in. |
| May | 61.6 °F | 85.1 °F | 3.26 in. |
| June | 69.3 °F | 90.1 °F | 5.59 in. |
| July | 71.9 °F | 92.3 °F | 5.22 in. |
| August | 71.5 °F | 91.2 °F | 5.92 in. |
| September | 66.6 °F | 86.6 °F | 3.71 in. |
| October | 55.7 °F | 78.8 °F | 2.94 in. |
| November | 44.9 °F | 70.0 °F | 2.64 in. |
| December | 39.7 °F | 62.9 °F | 3.95 in. |
| Annual | 54.8 °F | 77.6 °F | 48.17 in. |
| 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 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |