Morgan Hill, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.6 °F (low) to 72.5 °F (high). Annual precipitation averages 22.5 Inches. Morgan Hill is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.5 °F | 59.5 °F | 4.53 in. |
| February | 41.1 °F | 61.6 °F | 5.14 in. |
| March | 42.9 °F | 65.4 °F | 3.08 in. |
| April | 44.5 °F | 69.0 °F | 1.35 in. |
| May | 48.0 °F | 74.5 °F | 0.57 in. |
| June | 51.4 °F | 82.2 °F | 0.11 in. |
| July | 54.1 °F | 85.4 °F | 0.0 in. |
| August | 54.3 °F | 85.7 °F | 0.02 in. |
| September | 52.9 °F | 83.9 °F | 0.05 in. |
| October | 48.5 °F | 77.1 °F | 1.13 in. |
| November | 42.9 °F | 66.6 °F | 1.95 in. |
| December | 38.7 °F | 59.1 °F | 4.54 in. |
| Annual | 46.6 °F | 72.5 °F | 22.47 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |