Boyes Hot Springs, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.5 °C (low) to 21.9 °C (high). Annual precipitation averages 774.9 Millimeters. Boyes Hot Springs is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.7 °C | 14.1 °C | 152.65 mm |
| February | 4.6 °C | 16 °C | 160.27 mm |
| March | 5.4 °C | 18.1 °C | 102.62 mm |
| April | 6.4 °C | 20.7 °C | 47.5 mm |
| May | 8.4 °C | 23.1 °C | 27.69 mm |
| June | 10.3 °C | 27.4 °C | 5.84 mm |
| July | 11.4 °C | 28.8 °C | 0.51 mm |
| August | 11.5 °C | 28.6 °C | 1.27 mm |
| September | 10.4 °C | 28.6 °C | 2.79 mm |
| October | 8.6 °C | 25 °C | 40.89 mm |
| November | 5.5 °C | 18.4 °C | 76.45 mm |
| December | 3.6 °C | 14 °C | 156.46 mm |
| Annual | 7.5 °C | 21.9 °C | 774.94 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |