Pasadena, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 53.4 °F (low) to 77.5 °F (high). Annual precipitation averages 20.2 Inches. Pasadena is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.2 °F | 68.3 °F | 4.74 in. |
| February | 46.4 °F | 68.5 °F | 4.87 in. |
| March | 48.3 °F | 70.8 °F | 3.34 in. |
| April | 50.6 °F | 74.2 °F | 1.12 in. |
| May | 54.2 °F | 76.6 °F | 0.52 in. |
| June | 57.8 °F | 81.6 °F | 0.2 in. |
| July | 61.8 °F | 87.3 °F | 0.06 in. |
| August | 62.7 °F | 90.5 °F | 0.02 in. |
| September | 61.1 °F | 87.8 °F | 0.22 in. |
| October | 56.6 °F | 81.8 °F | 0.79 in. |
| November | 49.9 °F | 74.6 °F | 1.01 in. |
| December | 45.4 °F | 67.5 °F | 3.28 in. |
| Annual | 53.4 °F | 77.5 °F | 20.17 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 35°F to 30°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |