Graham, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.9 °F (low) to 77.3 °F (high). Annual precipitation averages 31.7 Inches. Graham 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.9 °F | 56.9 °F | 1.33 in. |
| February | 34.3 °F | 60.6 °F | 1.76 in. |
| March | 42.2 °F | 69.0 °F | 2.59 in. |
| April | 50.3 °F | 77.2 °F | 2.35 in. |
| May | 60.6 °F | 84.5 °F | 4.57 in. |
| June | 69.2 °F | 92.0 °F | 3.64 in. |
| July | 72.7 °F | 96.7 °F | 2.15 in. |
| August | 71.9 °F | 96.8 °F | 2.47 in. |
| September | 64.2 °F | 89.1 °F | 3.43 in. |
| October | 52.6 °F | 79.1 °F | 3.66 in. |
| November | 41.4 °F | 67.2 °F | 1.99 in. |
| December | 32.9 °F | 57.9 °F | 1.78 in. |
| Annual | 51.9 °F | 77.3 °F | 31.72 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |