New Sarpy, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.4 °C (low) to 25.7 °C (high). Annual precipitation averages 1665 Millimeters. New Sarpy is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.1 °C | 16.9 °C | 141.22 mm |
| February | 9 °C | 18.9 °C | 112.01 mm |
| March | 12.3 °C | 22.4 °C | 115.32 mm |
| April | 15.9 °C | 25.6 °C | 127 mm |
| May | 20.2 °C | 29.3 °C | 145.29 mm |
| June | 23.4 °C | 31.8 °C | 189.48 mm |
| July | 24.3 °C | 32.8 °C | 187.71 mm |
| August | 24.2 °C | 32.9 °C | 176.02 mm |
| September | 22.5 °C | 30.9 °C | 138.68 mm |
| October | 17.4 °C | 26.8 °C | 101.85 mm |
| November | 11.7 °C | 21.6 °C | 103.63 mm |
| December | 8.6 °C | 18.2 °C | 126.75 mm |
| Annual | 16.4 °C | 25.7 °C | 1664.96 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |