Robeline, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 25.2 °C (high). Annual precipitation averages 1430.3 Millimeters. Robeline 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 | 2.7 °C | 14.6 °C | 141.22 mm |
| February | 4.2 °C | 16.8 °C | 121.67 mm |
| March | 8.1 °C | 21.1 °C | 134.37 mm |
| April | 12.1 °C | 25.2 °C | 130.56 mm |
| May | 16.9 °C | 29.2 °C | 116.84 mm |
| June | 21.1 °C | 32.6 °C | 116.59 mm |
| July | 22.6 °C | 34.2 °C | 101.35 mm |
| August | 22.1 °C | 34.4 °C | 97.54 mm |
| September | 18.6 °C | 31.6 °C | 93.73 mm |
| October | 12.2 °C | 26.4 °C | 112.52 mm |
| November | 6.8 °C | 20.2 °C | 122.43 mm |
| December | 3.6 °C | 15.7 °C | 141.48 mm |
| Annual | 12.6 °C | 25.2 °C | 1430.3 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |