Blum, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.2 °C (low) to 25.6 °C (high). Annual precipitation averages 940.6 Millimeters. 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 | 1.2 °C | 14.6 °C | 64.77 mm |
| February | 3.3 °C | 16.8 °C | 64.52 mm |
| March | 7.6 °C | 20.8 °C | 83.31 mm |
| April | 11.7 °C | 25.2 °C | 83.06 mm |
| May | 16.9 °C | 29.2 °C | 112.52 mm |
| June | 20.9 °C | 33.3 °C | 99.06 mm |
| July | 22.6 °C | 35.8 °C | 49.28 mm |
| August | 22.4 °C | 36.2 °C | 61.21 mm |
| September | 18.6 °C | 32.5 °C | 77.72 mm |
| October | 12.4 °C | 26.8 °C | 104.14 mm |
| November | 6.8 °C | 20.1 °C | 71.37 mm |
| December | 2.2 °C | 15.4 °C | 69.6 mm |
| Annual | 12.2 °C | 25.6 °C | 940.56 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |