Pasadena, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 61.8 °F (low) to 78.9 °F (high). Annual precipitation averages 57.1 Inches. Pasadena is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.9 °F | 62.9 °F | 4.28 in. |
| February | 48.5 °F | 66.4 °F | 3.22 in. |
| March | 55.0 °F | 72.0 °F | 3.67 in. |
| April | 61.4 °F | 78.2 °F | 4.19 in. |
| May | 68.9 °F | 84.7 °F | 5.3 in. |
| June | 74.8 °F | 90.3 °F | 6.06 in. |
| July | 76.4 °F | 92.2 °F | 4.58 in. |
| August | 76.2 °F | 93.0 °F | 5.72 in. |
| September | 72.1 °F | 88.8 °F | 5.74 in. |
| October | 63.0 °F | 81.6 °F | 5.28 in. |
| November | 53.1 °F | 71.8 °F | 4.66 in. |
| December | 46.8 °F | 64.8 °F | 4.39 in. |
| Annual | 61.8 °F | 78.9 °F | 57.09 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |