Addison, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.9 °F (low) to 75.9 °F (high). Annual precipitation averages 40.6 Inches. Addison 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. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.6 °F | 55.6 °F | 2.67 in. |
| February | 39.2 °F | 59.9 °F | 3.0 in. |
| March | 46.9 °F | 67.4 °F | 3.6 in. |
| April | 54.6 °F | 75.2 °F | 3.56 in. |
| May | 64.0 °F | 82.7 °F | 4.99 in. |
| June | 72.0 °F | 90.4 °F | 3.93 in. |
| July | 75.3 °F | 94.8 °F | 2.12 in. |
| August | 75.1 °F | 95.0 °F | 2.27 in. |
| September | 67.7 °F | 88.2 °F | 3.14 in. |
| October | 56.5 °F | 78.1 °F | 4.79 in. |
| November | 46.1 °F | 66.2 °F | 3.1 in. |
| December | 37.5 °F | 57.5 °F | 3.38 in. |
| Annual | 55.9 °F | 75.9 °F | 40.55 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 |