American Canyon, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8.5 °C (low) to 21.2 °C (high). Annual precipitation averages 552.2 Millimeters. American Canyon 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. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.4 °C | 13.7 °C | 113.54 mm |
| February | 5.3 °C | 15.9 °C | 109.22 mm |
| March | 6.3 °C | 18.2 °C | 76.71 mm |
| April | 7.4 °C | 20.6 °C | 36.58 mm |
| May | 9.5 °C | 23.1 °C | 20.32 mm |
| June | 11.2 °C | 24.9 °C | 3.56 mm |
| July | 12.4 °C | 27.2 °C | 0 mm |
| August | 12.4 °C | 27.3 °C | 0.76 mm |
| September | 11.6 °C | 27.4 °C | 1.78 mm |
| October | 9.8 °C | 24.1 °C | 26.42 mm |
| November | 6.7 °C | 18.2 °C | 57.66 mm |
| December | 4.6 °C | 13.7 °C | 105.66 mm |
| Annual | 8.5 °C | 21.2 °C | 552.21 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| 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 |