Princeton, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 49.3 °F (low) to 75 °F (high). Annual precipitation averages 17.3 Inches. Princeton is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.1 °F | 56.1 °F | 3.56 in. |
| February | 41.5 °F | 61.3 °F | 3.19 in. |
| March | 43.8 °F | 66.7 °F | 2.32 in. |
| April | 46.5 °F | 72.7 °F | 1.23 in. |
| May | 53.4 °F | 80.8 °F | 0.79 in. |
| June | 59.1 °F | 88.1 °F | 0.23 in. |
| July | 61.6 °F | 93.3 °F | 0.03 in. |
| August | 59.8 °F | 92.3 °F | 0.07 in. |
| September | 56.3 °F | 88.6 °F | 0.14 in. |
| October | 49.8 °F | 79.1 °F | 0.76 in. |
| November | 42.5 °F | 64.8 °F | 1.85 in. |
| December | 38.5 °F | 55.8 °F | 3.11 in. |
| Annual | 49.3 °F | 75 °F | 17.28 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |