Jackson, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 8.3 °C (low) to 22.7 °C (high). Annual precipitation averages 778.8 Millimeters. Jackson is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.6 °C | 13.2 °C | 145.8 mm |
| February | 3.4 °C | 15 °C | 133.6 mm |
| March | 5.1 °C | 17.2 °C | 117.35 mm |
| April | 6.3 °C | 19.4 °C | 72.14 mm |
| May | 9.2 °C | 24.6 °C | 42.42 mm |
| June | 12.4 °C | 30.2 °C | 8.38 mm |
| July | 15 °C | 34.1 °C | 0.51 mm |
| August | 15.2 °C | 33.1 °C | 2.03 mm |
| September | 13.4 °C | 30.2 °C | 6.1 mm |
| October | 9.2 °C | 24.6 °C | 39.12 mm |
| November | 5.2 °C | 17.7 °C | 73.15 mm |
| December | 2.6 °C | 12.9 °C | 138.18 mm |
| Annual | 8.3 °C | 22.7 °C | 778.78 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°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 |