Concord, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 48.5 °F (low) to 72.1 °F (high). Annual precipitation averages 17.7 Inches. 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 | 39.9 °F | 56.5 °F | 3.64 in. |
| February | 41.5 °F | 60.8 °F | 3.59 in. |
| March | 44.3 °F | 65.5 °F | 2.5 in. |
| April | 47.0 °F | 69.4 °F | 1.43 in. |
| May | 51.2 °F | 75.6 °F | 0.59 in. |
| June | 54.9 °F | 82.3 °F | 0.16 in. |
| July | 57.1 °F | 86.5 °F | 0.0 in. |
| August | 56.9 °F | 86.7 °F | 0.02 in. |
| September | 55.5 °F | 84.1 °F | 0.07 in. |
| October | 51.0 °F | 76.4 °F | 0.74 in. |
| November | 43.8 °F | 64.9 °F | 1.68 in. |
| December | 39.4 °F | 56.7 °F | 3.3 in. |
| Annual | 48.5 °F | 72.1 °F | 17.72 in. |
| 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 : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |