Plum, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.2 °C (low) to 26.6 °C (high). Annual precipitation averages 1001 Millimeters. Plum is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.4 °C | 16.8 °C | 77.22 mm |
| February | 6.4 °C | 18.7 °C | 64.26 mm |
| March | 10.2 °C | 22.6 °C | 77.98 mm |
| April | 13.8 °C | 26.4 °C | 83.82 mm |
| May | 18.6 °C | 30.1 °C | 113.79 mm |
| June | 22.1 °C | 33.4 °C | 96.01 mm |
| July | 23 °C | 35.2 °C | 50.55 mm |
| August | 22.9 °C | 36 °C | 68.33 mm |
| September | 20.2 °C | 32.7 °C | 87.63 mm |
| October | 14.7 °C | 28 °C | 116.59 mm |
| November | 9.1 °C | 21.9 °C | 84.07 mm |
| December | 5.2 °C | 17.8 °C | 80.77 mm |
| Annual | 14.2 °C | 26.6 °C | 1001.02 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |