Hessmer, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.5 °C (low) to 25.3 °C (high). Annual precipitation averages 1560.8 Millimeters. Hessmer is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.7 °C | 15.2 °C | 163.58 mm |
| February | 5.7 °C | 17.6 °C | 131.57 mm |
| March | 9.4 °C | 21.7 °C | 121.16 mm |
| April | 13.2 °C | 25.4 °C | 139.19 mm |
| May | 17.9 °C | 29.4 °C | 129.54 mm |
| June | 21.5 °C | 32.3 °C | 129.29 mm |
| July | 22.7 °C | 33.4 °C | 118.62 mm |
| August | 22.3 °C | 33.8 °C | 115.82 mm |
| September | 19.4 °C | 31.4 °C | 112.27 mm |
| October | 13.3 °C | 26.7 °C | 115.57 mm |
| November | 7.8 °C | 20.8 °C | 139.7 mm |
| December | 4.8 °C | 16.4 °C | 144.53 mm |
| Annual | 13.5 °C | 25.3 °C | 1560.84 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 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 |