Georgetown, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.5 °C (low) to 25.3 °C (high). Annual precipitation averages 1519.9 Millimeters. Georgetown 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 | 2.7 °C | 15 °C | 150.11 mm |
| February | 4.3 °C | 17.2 °C | 134.11 mm |
| March | 7.9 °C | 21.7 °C | 141.48 mm |
| April | 11.9 °C | 25.5 °C | 146.81 mm |
| May | 16.8 °C | 29.4 °C | 123.95 mm |
| June | 20.7 °C | 32.3 °C | 121.67 mm |
| July | 22.2 °C | 34 °C | 115.82 mm |
| August | 21.7 °C | 34.4 °C | 96.27 mm |
| September | 18.5 °C | 31.6 °C | 99.06 mm |
| October | 12.4 °C | 26.7 °C | 113.03 mm |
| November | 6.7 °C | 20.4 °C | 131.06 mm |
| December | 3.7 °C | 15.9 °C | 146.56 mm |
| Annual | 12.5 °C | 25.3 °C | 1519.93 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |