Denham Springs, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.1 °C (low) to 25.8 °C (high). Annual precipitation averages 1665.7 Millimeters. Denham Springs is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.9 °C | 16.6 °C | 155.45 mm |
| February | 6.7 °C | 18.8 °C | 125.22 mm |
| March | 10.1 °C | 22.5 °C | 121.41 mm |
| April | 13.5 °C | 25.8 °C | 130.05 mm |
| May | 18 °C | 29.6 °C | 149.61 mm |
| June | 21.6 °C | 32.1 °C | 170.94 mm |
| July | 22.8 °C | 33 °C | 154.94 mm |
| August | 22.5 °C | 33.3 °C | 174.5 mm |
| September | 20.1 °C | 31.3 °C | 119.63 mm |
| October | 14.1 °C | 27.1 °C | 122.68 mm |
| November | 8.6 °C | 21.6 °C | 105.66 mm |
| December | 5.8 °C | 17.8 °C | 135.64 mm |
| Annual | 14.1 °C | 25.8 °C | 1665.73 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°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 |