Morgan Hill, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8.1 °C (low) to 22.5 °C (high). Annual precipitation averages 570.7 Millimeters. 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 | 4.2 °C | 15.3 °C | 115.06 mm |
| February | 5.1 °C | 16.4 °C | 130.56 mm |
| March | 6.1 °C | 18.6 °C | 78.23 mm |
| April | 6.9 °C | 20.6 °C | 34.29 mm |
| May | 8.9 °C | 23.6 °C | 14.48 mm |
| June | 10.8 °C | 27.9 °C | 2.79 mm |
| July | 12.3 °C | 29.7 °C | 0 mm |
| August | 12.4 °C | 29.8 °C | 0.51 mm |
| September | 11.6 °C | 28.8 °C | 1.27 mm |
| October | 9.2 °C | 25.1 °C | 28.7 mm |
| November | 6.1 °C | 19.2 °C | 49.53 mm |
| December | 3.7 °C | 15.1 °C | 115.32 mm |
| Annual | 8.1 °C | 22.5 °C | 570.74 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |