Boron, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 47.6 °F (low) to 78.1 °F (high). Annual precipitation averages 5.8 Inches. Boron is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.3 °F | 59.1 °F | 1.09 in. |
| February | 35.1 °F | 62.1 °F | 1.32 in. |
| March | 40.0 °F | 67.9 °F | 0.91 in. |
| April | 44.9 °F | 74.4 °F | 0.38 in. |
| May | 52.5 °F | 83.0 °F | 0.13 in. |
| June | 60.5 °F | 93.2 °F | 0.03 in. |
| July | 66.6 °F | 99.6 °F | 0.15 in. |
| August | 65.2 °F | 99.4 °F | 0.09 in. |
| September | 58.5 °F | 92.4 °F | 0.16 in. |
| October | 47.9 °F | 80.5 °F | 0.25 in. |
| November | 36.8 °F | 67.5 °F | 0.34 in. |
| December | 31.0 °F | 57.8 °F | 0.9 in. |
| Annual | 47.6 °F | 78.1 °F | 5.75 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 40-50 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 |