Plum, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.6 °F (low) to 80 °F (high). Annual precipitation averages 39.4 Inches. 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 | 39.9 °F | 62.3 °F | 3.04 in. |
| February | 43.6 °F | 65.7 °F | 2.53 in. |
| March | 50.3 °F | 72.6 °F | 3.07 in. |
| April | 56.9 °F | 79.6 °F | 3.3 in. |
| May | 65.4 °F | 86.2 °F | 4.48 in. |
| June | 71.7 °F | 92.2 °F | 3.78 in. |
| July | 73.4 °F | 95.4 °F | 1.99 in. |
| August | 73.3 °F | 96.8 °F | 2.69 in. |
| September | 68.4 °F | 90.8 °F | 3.45 in. |
| October | 58.4 °F | 82.4 °F | 4.59 in. |
| November | 48.4 °F | 71.5 °F | 3.31 in. |
| December | 41.3 °F | 64.0 °F | 3.18 in. |
| Annual | 57.6 °F | 80 °F | 39.41 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |