Santa Ynez, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.3 °F (low) to 74.4 °F (high). Annual precipitation averages 19.8 Inches. Santa Ynez is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.9 °F | 64.9 °F | 4.59 in. |
| February | 41.2 °F | 65.0 °F | 4.57 in. |
| March | 42.6 °F | 67.1 °F | 3.7 in. |
| April | 44.0 °F | 71.3 °F | 1.17 in. |
| May | 47.4 °F | 75.0 °F | 0.43 in. |
| June | 50.3 °F | 79.4 °F | 0.05 in. |
| July | 53.7 °F | 84.5 °F | 0.04 in. |
| August | 54.2 °F | 85.8 °F | 0.0 in. |
| September | 52.4 °F | 84.5 °F | 0.07 in. |
| October | 48.5 °F | 79.8 °F | 0.78 in. |
| November | 42.9 °F | 71.2 °F | 1.3 in. |
| December | 39.0 °F | 64.6 °F | 3.08 in. |
| Annual | 46.3 °F | 74.4 °F | 19.78 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |