Llano, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.6 °F (low) to 79.4 °F (high). Annual precipitation averages 26.7 Inches. Llano is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.5 °F | 61.2 °F | 1.49 in. |
| February | 36.8 °F | 65.0 °F | 1.63 in. |
| March | 44.1 °F | 71.8 °F | 2.47 in. |
| April | 51.7 °F | 79.4 °F | 2.01 in. |
| May | 61.5 °F | 85.6 °F | 3.76 in. |
| June | 68.8 °F | 92.7 °F | 2.8 in. |
| July | 70.9 °F | 96.0 °F | 1.57 in. |
| August | 70.8 °F | 97.1 °F | 1.58 in. |
| September | 64.7 °F | 90.6 °F | 2.3 in. |
| October | 52.8 °F | 81.4 °F | 2.99 in. |
| November | 42.7 °F | 70.4 °F | 2.11 in. |
| December | 34.1 °F | 62.0 °F | 1.96 in. |
| Annual | 52.6 °F | 79.4 °F | 26.67 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 |