Benbow, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.5 °C (low) to 21 °C (high). Annual precipitation averages 1567.2 Millimeters. Benbow is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.4 °C | 12.2 °C | 303.78 mm |
| February | 3.6 °C | 13.8 °C | 248.67 mm |
| March | 4.2 °C | 15.9 °C | 222.76 mm |
| April | 5.1 °C | 18.8 °C | 117.86 mm |
| May | 7.3 °C | 22.3 °C | 54.1 mm |
| June | 9.3 °C | 25.7 °C | 18.8 mm |
| July | 11.2 °C | 31.1 °C | 1.52 mm |
| August | 11 °C | 31.2 °C | 2.29 mm |
| September | 8.8 °C | 29.6 °C | 10.67 mm |
| October | 6.6 °C | 24.1 °C | 80.52 mm |
| November | 4.8 °C | 15.3 °C | 169.67 mm |
| December | 2.9 °C | 11.4 °C | 336.55 mm |
| Annual | 6.5 °C | 21 °C | 1567.19 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Mar. 1 - Mar. 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 | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |