Rosamond, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 9 °C (low) to 25.5 °C (high). Annual precipitation averages 148.1 Millimeters. Rosamond is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.2 °C | 15.3 °C | 27.94 mm |
| February | 1.9 °C | 16.8 °C | 40.13 mm |
| March | 4.7 °C | 20 °C | 23.11 mm |
| April | 7.5 °C | 23.3 °C | 7.11 mm |
| May | 11.9 °C | 27.9 °C | 2.29 mm |
| June | 16.6 °C | 33.3 °C | 1.52 mm |
| July | 19.8 °C | 37 °C | 3.05 mm |
| August | 18.9 °C | 37.1 °C | 1.02 mm |
| September | 14.8 °C | 33.8 °C | 3.05 mm |
| October | 9 °C | 27.2 °C | 6.6 mm |
| November | 2.7 °C | 20.1 °C | 8.38 mm |
| December | -0.6 °C | 14.6 °C | 23.88 mm |
| Annual | 9 °C | 25.5 °C | 148.08 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |