American Canyon, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 47.3 °F (low) to 70.2 °F (high). Annual precipitation averages 21.7 Inches. 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 | 40.0 °F | 56.6 °F | 4.47 in. |
| February | 41.6 °F | 60.7 °F | 4.3 in. |
| March | 43.4 °F | 64.8 °F | 3.02 in. |
| April | 45.4 °F | 69.0 °F | 1.44 in. |
| May | 49.1 °F | 73.5 °F | 0.8 in. |
| June | 52.2 °F | 76.8 °F | 0.14 in. |
| July | 54.3 °F | 81.0 °F | 0.0 in. |
| August | 54.4 °F | 81.1 °F | 0.03 in. |
| September | 52.8 °F | 81.4 °F | 0.07 in. |
| October | 49.6 °F | 75.4 °F | 1.04 in. |
| November | 44.0 °F | 64.8 °F | 2.27 in. |
| December | 40.2 °F | 56.7 °F | 4.16 in. |
| Annual | 47.3 °F | 70.2 °F | 21.74 in. |
| 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 : 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 |