Old Station, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 1.7 °C (low) to 17.2 °C (high). Annual precipitation averages 858.8 Millimeters. Old Station is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.7 °C | 6.6 °C | 133.35 mm |
| February | -3.8 °C | 8.6 °C | 118.11 mm |
| March | -1.9 °C | 11.3 °C | 112.01 mm |
| April | 0.2 °C | 14.3 °C | 77.22 mm |
| May | 4 °C | 19.3 °C | 66.04 mm |
| June | 7.1 °C | 24.8 °C | 29.46 mm |
| July | 10.2 °C | 30.1 °C | 8.38 mm |
| August | 8.9 °C | 29.6 °C | 7.11 mm |
| September | 5.8 °C | 26.2 °C | 16.26 mm |
| October | 1.4 °C | 19.2 °C | 52.07 mm |
| November | -2.2 °C | 10.8 °C | 88.14 mm |
| December | -5.1 °C | 5.6 °C | 150.62 mm |
| Annual | 1.7 °C | 17.2 °C | 858.77 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |