De Kalb, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.1 °F (low) to 75.1 °F (high). Annual precipitation averages 50.3 Inches. De Kalb is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.5 °F | 54.7 °F | 3.58 in. |
| February | 35.9 °F | 58.7 °F | 4.36 in. |
| March | 43.3 °F | 66.7 °F | 4.8 in. |
| April | 50.7 °F | 74.7 °F | 4.66 in. |
| May | 60.4 °F | 81.8 °F | 5.45 in. |
| June | 68.2 °F | 89.5 °F | 3.9 in. |
| July | 71.4 °F | 93.8 °F | 3.24 in. |
| August | 70.2 °F | 94.2 °F | 2.95 in. |
| September | 63.8 °F | 87.9 °F | 4.06 in. |
| October | 51.7 °F | 77.3 °F | 4.6 in. |
| November | 42.0 °F | 65.5 °F | 4.02 in. |
| December | 34.7 °F | 56.6 °F | 4.7 in. |
| Annual | 52.1 °F | 75.1 °F | 50.32 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |