Yankee Hill, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 10.8 °C (low) to 22 °C (high). Annual precipitation averages 1413 Millimeters. 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 | 4.6 °C | 12.3 °C | 272.29 mm |
| February | 5.3 °C | 13.8 °C | 255.27 mm |
| March | 6.5 °C | 16.1 °C | 204.98 mm |
| April | 8.1 °C | 19.2 °C | 111.51 mm |
| May | 11.6 °C | 24.1 °C | 62.74 mm |
| June | 15.5 °C | 29.5 °C | 21.84 mm |
| July | 18.9 °C | 33.7 °C | 1.27 mm |
| August | 18.3 °C | 33.2 °C | 2.29 mm |
| September | 16.6 °C | 30.6 °C | 10.67 mm |
| October | 12.2 °C | 23.9 °C | 67.31 mm |
| November | 7.3 °C | 16.1 °C | 126.49 mm |
| December | 4.3 °C | 11.8 °C | 276.35 mm |
| Annual | 10.8 °C | 22 °C | 1413.01 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |