Durham, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.4 °C (low) to 23.8 °C (high). Annual precipitation averages 658.1 Millimeters. Durham is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.4 °C | 13.3 °C | 126.75 mm |
| February | 4.7 °C | 16.2 °C | 117.86 mm |
| March | 6.1 °C | 18.9 °C | 92.2 mm |
| April | 7.8 °C | 22.1 °C | 45.72 mm |
| May | 11.4 °C | 26.7 °C | 28.7 mm |
| June | 14.8 °C | 31.1 °C | 12.45 mm |
| July | 16.7 °C | 34.2 °C | 0.51 mm |
| August | 15.8 °C | 33.7 °C | 2.03 mm |
| September | 13.7 °C | 31.6 °C | 4.83 mm |
| October | 9.9 °C | 26 °C | 36.32 mm |
| November | 5.6 °C | 18.2 °C | 66.04 mm |
| December | 3.3 °C | 13.2 °C | 124.71 mm |
| Annual | 9.4 °C | 23.8 °C | 658.12 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |