Occidental, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.8 °F (low) to 68.6 °F (high). Annual precipitation averages 53.9 Inches. Occidental 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 | 41.1 °F | 55.7 °F | 10.18 in. |
| February | 42.1 °F | 58.7 °F | 10.22 in. |
| March | 43.1 °F | 62.3 °F | 7.44 in. |
| April | 44.2 °F | 66.8 °F | 3.53 in. |
| May | 47.4 °F | 71.7 °F | 2.07 in. |
| June | 50.6 °F | 77.5 °F | 0.59 in. |
| July | 51.8 °F | 79.5 °F | 0.06 in. |
| August | 52.8 °F | 79.9 °F | 0.19 in. |
| September | 52.1 °F | 79.2 °F | 0.22 in. |
| October | 50.3 °F | 74.4 °F | 2.5 in. |
| November | 44.6 °F | 62.6 °F | 5.5 in. |
| December | 40.9 °F | 55.3 °F | 11.4 in. |
| Annual | 46.8 °F | 68.6 °F | 53.9 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 |