Monticello, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.8 °F (low) to 74.3 °F (high). Annual precipitation averages 47.3 Inches. Monticello is located in USDA Plant Hardiness Zone 8b. 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 | 32.9 °F | 55.9 °F | 4.16 in. |
| February | 35.7 °F | 59.7 °F | 4.37 in. |
| March | 41.1 °F | 67.3 °F | 4.89 in. |
| April | 48.5 °F | 74.8 °F | 3.78 in. |
| May | 57.8 °F | 82.0 °F | 2.64 in. |
| June | 66.0 °F | 87.8 °F | 4.41 in. |
| July | 69.6 °F | 90.8 °F | 4.44 in. |
| August | 68.8 °F | 89.5 °F | 4.16 in. |
| September | 62.7 °F | 84.5 °F | 3.64 in. |
| October | 51.0 °F | 75.4 °F | 2.8 in. |
| November | 40.1 °F | 65.9 °F | 3.56 in. |
| December | 34.9 °F | 57.9 °F | 4.46 in. |
| Annual | 50.8 °F | 74.3 °F | 47.31 in. |
| 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 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 |