Blum, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54 °F (low) to 78 °F (high). Annual precipitation averages 37 Inches. Blum is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.1 °F | 58.2 °F | 2.55 in. |
| February | 38.0 °F | 62.3 °F | 2.54 in. |
| March | 45.6 °F | 69.5 °F | 3.28 in. |
| April | 53.0 °F | 77.3 °F | 3.27 in. |
| May | 62.4 °F | 84.6 °F | 4.43 in. |
| June | 69.7 °F | 92.0 °F | 3.9 in. |
| July | 72.6 °F | 96.5 °F | 1.94 in. |
| August | 72.3 °F | 97.1 °F | 2.41 in. |
| September | 65.4 °F | 90.5 °F | 3.06 in. |
| October | 54.4 °F | 80.2 °F | 4.1 in. |
| November | 44.2 °F | 68.1 °F | 2.81 in. |
| December | 35.9 °F | 59.8 °F | 2.74 in. |
| Annual | 54 °F | 78 °F | 37.03 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 |