Concord, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 9.2 °C (low) to 22.3 °C (high). Annual precipitation averages 450.1 Millimeters. Concord is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.4 °C | 13.6 °C | 92.46 mm |
| February | 5.3 °C | 16 °C | 91.19 mm |
| March | 6.8 °C | 18.6 °C | 63.5 mm |
| April | 8.3 °C | 20.8 °C | 36.32 mm |
| May | 10.7 °C | 24.2 °C | 14.99 mm |
| June | 12.7 °C | 27.9 °C | 4.06 mm |
| July | 13.9 °C | 30.3 °C | 0 mm |
| August | 13.8 °C | 30.4 °C | 0.51 mm |
| September | 13.1 °C | 28.9 °C | 1.78 mm |
| October | 10.6 °C | 24.7 °C | 18.8 mm |
| November | 6.6 °C | 18.3 °C | 42.67 mm |
| December | 4.1 °C | 13.7 °C | 83.82 mm |
| Annual | 9.2 °C | 22.3 °C | 450.1 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |