Vienna, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 24.6 °C (high). Annual precipitation averages 1424.2 Millimeters. Vienna 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 | 1.4 °C | 13.8 °C | 139.7 mm |
| February | 3.1 °C | 16.2 °C | 127.51 mm |
| March | 6.8 °C | 20.6 °C | 132.08 mm |
| April | 10.8 °C | 24.6 °C | 138.43 mm |
| May | 16.1 °C | 28.6 °C | 117.86 mm |
| June | 20.2 °C | 32.2 °C | 115.82 mm |
| July | 21.9 °C | 33.8 °C | 95.5 mm |
| August | 21.4 °C | 33.9 °C | 92.71 mm |
| September | 17.7 °C | 31.3 °C | 91.69 mm |
| October | 11.3 °C | 25.8 °C | 120.4 mm |
| November | 5.9 °C | 19.4 °C | 115.32 mm |
| December | 2.4 °C | 14.9 °C | 137.16 mm |
| Annual | 11.6 °C | 24.6 °C | 1424.18 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |