Azusa, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 53.7 °F (low) to 78.4 °F (high). Annual precipitation averages 19.3 Inches. Azusa is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.0 °F | 68.9 °F | 4.5 in. |
| February | 46.6 °F | 69.2 °F | 4.86 in. |
| March | 48.5 °F | 71.8 °F | 3.22 in. |
| April | 50.8 °F | 74.7 °F | 1.01 in. |
| May | 55.0 °F | 77.6 °F | 0.56 in. |
| June | 58.4 °F | 83.1 °F | 0.2 in. |
| July | 62.3 °F | 89.7 °F | 0.08 in. |
| August | 62.9 °F | 91.7 °F | 0.01 in. |
| September | 61.4 °F | 89.1 °F | 0.19 in. |
| October | 56.7 °F | 82.3 °F | 0.74 in. |
| November | 50.2 °F | 75.1 °F | 0.98 in. |
| December | 45.1 °F | 68.0 °F | 2.94 in. |
| Annual | 53.7 °F | 78.4 °F | 19.29 in. |
| Average First Frost Date | Jan. 21 - Jan. 31 |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |