Ramona, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.6 °F (low) to 76.9 °F (high). Annual precipitation averages 16.1 Inches. Ramona 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 | 38.7 °F | 66.6 °F | 2.99 in. |
| February | 39.2 °F | 66.6 °F | 3.8 in. |
| March | 41.1 °F | 68.5 °F | 2.71 in. |
| April | 42.9 °F | 71.7 °F | 1.23 in. |
| May | 48.3 °F | 76.0 °F | 0.48 in. |
| June | 51.5 °F | 83.0 °F | 0.06 in. |
| July | 56.6 °F | 89.6 °F | 0.17 in. |
| August | 57.8 °F | 91.9 °F | 0.08 in. |
| September | 55.0 °F | 88.8 °F | 0.22 in. |
| October | 48.6 °F | 80.8 °F | 0.76 in. |
| November | 42.0 °F | 73.4 °F | 1.2 in. |
| December | 37.3 °F | 66.2 °F | 2.37 in. |
| Annual | 46.6 °F | 76.9 °F | 16.07 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 40-50 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 | Csb - Warm-Summer Mediterranean Climate |