Rosamond, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 48.1 °F (low) to 78 °F (high). Annual precipitation averages 5.8 Inches. 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 | 32.3 °F | 59.5 °F | 1.1 in. |
| February | 35.4 °F | 62.3 °F | 1.58 in. |
| March | 40.4 °F | 68.0 °F | 0.91 in. |
| April | 45.5 °F | 74.0 °F | 0.28 in. |
| May | 53.4 °F | 82.2 °F | 0.09 in. |
| June | 61.8 °F | 91.9 °F | 0.06 in. |
| July | 67.7 °F | 98.6 °F | 0.12 in. |
| August | 66.0 °F | 98.7 °F | 0.04 in. |
| September | 58.7 °F | 92.8 °F | 0.12 in. |
| October | 48.2 °F | 81.0 °F | 0.26 in. |
| November | 36.9 °F | 68.1 °F | 0.33 in. |
| December | 30.9 °F | 58.3 °F | 0.94 in. |
| Annual | 48.1 °F | 78 °F | 5.83 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |