College City, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 48.8 °F (low) to 75.2 °F (high). Annual precipitation averages 18.7 Inches. College City is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.9 °F | 55.8 °F | 3.78 in. |
| February | 41.3 °F | 61.1 °F | 3.87 in. |
| March | 43.8 °F | 66.5 °F | 2.37 in. |
| April | 46.3 °F | 72.7 °F | 1.23 in. |
| May | 52.7 °F | 80.9 °F | 0.75 in. |
| June | 57.9 °F | 88.6 °F | 0.21 in. |
| July | 60.0 °F | 93.7 °F | 0.01 in. |
| August | 58.7 °F | 92.9 °F | 0.08 in. |
| September | 55.8 °F | 89.5 °F | 0.15 in. |
| October | 49.6 °F | 79.5 °F | 0.84 in. |
| November | 42.4 °F | 65.0 °F | 1.89 in. |
| December | 38.3 °F | 55.8 °F | 3.5 in. |
| Annual | 48.8 °F | 75.2 °F | 18.68 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| 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 |