Cool, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.9 °F (low) to 76.8 °F (high). Annual precipitation averages 33.8 Inches. Cool 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 | 32.3 °F | 57.2 °F | 1.86 in. |
| February | 36.0 °F | 60.7 °F | 2.36 in. |
| March | 43.8 °F | 68.7 °F | 3.04 in. |
| April | 51.5 °F | 76.7 °F | 2.81 in. |
| May | 61.4 °F | 83.4 °F | 4.27 in. |
| June | 69.5 °F | 91.1 °F | 3.65 in. |
| July | 72.8 °F | 95.6 °F | 2.0 in. |
| August | 72.1 °F | 96.0 °F | 2.55 in. |
| September | 64.7 °F | 88.7 °F | 2.92 in. |
| October | 53.3 °F | 78.6 °F | 3.78 in. |
| November | 42.7 °F | 66.8 °F | 2.43 in. |
| December | 34.2 °F | 58.2 °F | 2.08 in. |
| Annual | 52.9 °F | 76.8 °F | 33.75 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |