Trinity, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.7 °F (low) to 78.6 °F (high). Annual precipitation averages 48.8 Inches. Trinity 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 | 37.9 °F | 60.6 °F | 4.24 in. |
| February | 41.6 °F | 64.6 °F | 3.56 in. |
| March | 47.9 °F | 71.5 °F | 4.06 in. |
| April | 54.7 °F | 78.1 °F | 3.75 in. |
| May | 63.6 °F | 84.8 °F | 4.58 in. |
| June | 70.2 °F | 91.1 °F | 4.63 in. |
| July | 72.5 °F | 94.0 °F | 3.29 in. |
| August | 72.0 °F | 95.3 °F | 3.87 in. |
| September | 66.4 °F | 89.7 °F | 3.79 in. |
| October | 55.9 °F | 81.1 °F | 4.25 in. |
| November | 46.2 °F | 70.2 °F | 4.4 in. |
| December | 39.5 °F | 62.1 °F | 4.39 in. |
| Annual | 55.7 °F | 78.6 °F | 48.81 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |