Boron, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 8.7 °C (low) to 25.6 °C (high). Annual precipitation averages 146.1 Millimeters. 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 | 0.2 °C | 15.1 °C | 27.69 mm |
| February | 1.7 °C | 16.7 °C | 33.53 mm |
| March | 4.4 °C | 19.9 °C | 23.11 mm |
| April | 7.2 °C | 23.6 °C | 9.65 mm |
| May | 11.4 °C | 28.3 °C | 3.3 mm |
| June | 15.8 °C | 34 °C | 0.76 mm |
| July | 19.2 °C | 37.6 °C | 3.81 mm |
| August | 18.4 °C | 37.4 °C | 2.29 mm |
| September | 14.7 °C | 33.6 °C | 4.06 mm |
| October | 8.8 °C | 26.9 °C | 6.35 mm |
| November | 2.7 °C | 19.7 °C | 8.64 mm |
| December | -0.6 °C | 14.3 °C | 22.86 mm |
| Annual | 8.7 °C | 25.6 °C | 146.05 mm |
| 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 : -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 |