Dean, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.2 °F (low) to 75.9 °F (high). Annual precipitation averages 30.9 Inches. Dean is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.1 °F | 54.4 °F | 1.38 in. |
| February | 33.2 °F | 58.7 °F | 1.67 in. |
| March | 41.5 °F | 67.2 °F | 2.42 in. |
| April | 49.4 °F | 75.5 °F | 2.9 in. |
| May | 60.1 °F | 83.4 °F | 4.11 in. |
| June | 68.6 °F | 91.7 °F | 3.65 in. |
| July | 72.3 °F | 96.7 °F | 2.26 in. |
| August | 71.4 °F | 96.5 °F | 2.46 in. |
| September | 63.6 °F | 88.4 °F | 3.04 in. |
| October | 51.8 °F | 77.8 °F | 3.19 in. |
| November | 40.7 °F | 65.4 °F | 2.04 in. |
| December | 31.7 °F | 55.6 °F | 1.79 in. |
| Annual | 51.2 °F | 75.9 °F | 30.91 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |