Artois, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.6 °C (low) to 24.1 °C (high). Annual precipitation averages 536 Millimeters. Artois is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.6 °C | 13.7 °C | 113.79 mm |
| February | 4.9 °C | 16.5 °C | 104.39 mm |
| March | 6.2 °C | 19.2 °C | 70.36 mm |
| April | 7.7 °C | 22.8 °C | 31.24 mm |
| May | 11.6 °C | 27.2 °C | 26.42 mm |
| June | 15.1 °C | 31.4 °C | 8.13 mm |
| July | 16.7 °C | 34.1 °C | 0.51 mm |
| August | 15.7 °C | 33.6 °C | 1.27 mm |
| September | 13.9 °C | 31.9 °C | 3.56 mm |
| October | 10.3 °C | 26.7 °C | 22.86 mm |
| November | 5.8 °C | 18.4 °C | 52.07 mm |
| December | 3.3 °C | 13.4 °C | 101.35 mm |
| Annual | 9.6 °C | 24.1 °C | 535.95 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |