Rosser, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.5 °F (low) to 76.7 °F (high). Annual precipitation averages 41.1 Inches. Rosser 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 | 34.8 °F | 56.5 °F | 3.09 in. |
| February | 38.7 °F | 60.9 °F | 3.05 in. |
| March | 45.9 °F | 67.9 °F | 3.7 in. |
| April | 52.9 °F | 75.5 °F | 3.77 in. |
| May | 62.9 °F | 82.8 °F | 4.65 in. |
| June | 70.5 °F | 90.8 °F | 3.79 in. |
| July | 73.2 °F | 95.0 °F | 1.88 in. |
| August | 72.9 °F | 95.9 °F | 2.47 in. |
| September | 66.2 °F | 89.5 °F | 3.04 in. |
| October | 55.0 °F | 79.2 °F | 4.86 in. |
| November | 44.5 °F | 67.4 °F | 3.07 in. |
| December | 36.9 °F | 58.7 °F | 3.74 in. |
| Annual | 54.5 °F | 76.7 °F | 41.11 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |