Glen Rose, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.3 °F (low) to 78.5 °F (high). Annual precipitation averages 36.2 Inches. Glen Rose is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.8 °F | 58.6 °F | 2.17 in. |
| February | 36.9 °F | 62.9 °F | 2.47 in. |
| March | 44.6 °F | 70.4 °F | 3.33 in. |
| April | 52.5 °F | 78.4 °F | 3.11 in. |
| May | 62.0 °F | 85.4 °F | 4.62 in. |
| June | 69.8 °F | 92.6 °F | 4.08 in. |
| July | 72.8 °F | 97.2 °F | 1.8 in. |
| August | 72.1 °F | 97.6 °F | 2.55 in. |
| September | 64.7 °F | 90.5 °F | 3.2 in. |
| October | 53.6 °F | 80.1 °F | 3.98 in. |
| November | 43.2 °F | 68.2 °F | 2.52 in. |
| December | 34.6 °F | 60.0 °F | 2.36 in. |
| Annual | 53.3 °F | 78.5 °F | 36.19 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |