Yankee Hill, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 51.4 °F (low) to 71.7 °F (high). Annual precipitation averages 55.6 Inches. Yankee Hill is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.2 °F | 54.1 °F | 10.72 in. |
| February | 41.6 °F | 56.8 °F | 10.05 in. |
| March | 43.7 °F | 61.0 °F | 8.07 in. |
| April | 46.5 °F | 66.6 °F | 4.39 in. |
| May | 52.8 °F | 75.4 °F | 2.47 in. |
| June | 59.9 °F | 85.1 °F | 0.86 in. |
| July | 66.0 °F | 92.7 °F | 0.05 in. |
| August | 65.0 °F | 91.7 °F | 0.09 in. |
| September | 61.8 °F | 87.0 °F | 0.42 in. |
| October | 54.0 °F | 75.1 °F | 2.65 in. |
| November | 45.1 °F | 61.0 °F | 4.98 in. |
| December | 39.7 °F | 53.3 °F | 10.88 in. |
| Annual | 51.4 °F | 71.7 °F | 55.63 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 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 | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |