| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Dec. 11 - Dec. 20 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 94519 - Concord, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 37 | 40 | 41 | 44 | 49 | 53 | 55 | 55 | 53 | 48 | 42 | 37 | 46 |
| Avg Max Temp (°F) | 54 | 60 | 64 | 70 | 76 | 83 | 87 | 88 | 84 | 76 | 63 | 54 | 72 |
| Avg Precip (In.) | 4.01 | 3.12 | 2.34 | 1.18 | .67 | .12 | .04 | .03 | .11 | .93 | 1.85 | 2.92 | 17.33 |