Gueydan, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.9 °F (low) to 77.6 °F (high). Annual precipitation averages 61.6 Inches. Gueydan is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.0 °F | 60.6 °F | 5.48 in. |
| February | 45.5 °F | 64.3 °F | 4.04 in. |
| March | 51.8 °F | 71.0 °F | 3.44 in. |
| April | 58.7 °F | 77.3 °F | 4.45 in. |
| May | 66.8 °F | 84.1 °F | 5.04 in. |
| June | 72.6 °F | 89.2 °F | 6.36 in. |
| July | 74.3 °F | 90.8 °F | 6.01 in. |
| August | 73.6 °F | 91.4 °F | 6.25 in. |
| September | 69.3 °F | 88.1 °F | 5.65 in. |
| October | 59.1 °F | 80.7 °F | 4.85 in. |
| November | 49.4 °F | 70.3 °F | 5.53 in. |
| December | 43.9 °F | 62.9 °F | 4.46 in. |
| Annual | 58.9 °F | 77.6 °F | 61.56 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |