Rosharon, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 60.5 °F (low) to 79.2 °F (high). Annual precipitation averages 54.6 Inches. Rosharon is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.2 °F | 63.2 °F | 4.22 in. |
| February | 48.0 °F | 66.6 °F | 2.93 in. |
| March | 53.8 °F | 72.7 °F | 3.41 in. |
| April | 59.9 °F | 78.4 °F | 3.97 in. |
| May | 67.6 °F | 84.8 °F | 4.95 in. |
| June | 73.3 °F | 90.3 °F | 5.37 in. |
| July | 74.6 °F | 92.0 °F | 4.35 in. |
| August | 74.6 °F | 93.0 °F | 5.59 in. |
| September | 70.7 °F | 89.1 °F | 6.06 in. |
| October | 61.4 °F | 82.3 °F | 5.01 in. |
| November | 52.1 °F | 72.6 °F | 4.52 in. |
| December | 46.0 °F | 65.3 °F | 4.18 in. |
| Annual | 60.5 °F | 79.2 °F | 54.56 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |