Ramona, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8.1 °C (low) to 25 °C (high). Annual precipitation averages 408.2 Millimeters. 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 | 3.7 °C | 19.2 °C | 75.95 mm |
| February | 4 °C | 19.2 °C | 96.52 mm |
| March | 5.1 °C | 20.3 °C | 68.83 mm |
| April | 6.1 °C | 22.1 °C | 31.24 mm |
| May | 9.1 °C | 24.4 °C | 12.19 mm |
| June | 10.8 °C | 28.3 °C | 1.52 mm |
| July | 13.7 °C | 32 °C | 4.32 mm |
| August | 14.3 °C | 33.3 °C | 2.03 mm |
| September | 12.8 °C | 31.6 °C | 5.59 mm |
| October | 9.2 °C | 27.1 °C | 19.3 mm |
| November | 5.6 °C | 23 °C | 30.48 mm |
| December | 2.9 °C | 19 °C | 60.2 mm |
| Annual | 8.1 °C | 25 °C | 408.17 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |