Johannesburg, California has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 52.1 °F (low) to 74.9 °F (high). Annual precipitation averages 6.5 Inches. Johannesburg is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.5 °F | 55.4 °F | 1.53 in. |
| February | 39.6 °F | 58.1 °F | 1.68 in. |
| March | 43.4 °F | 64.8 °F | 0.84 in. |
| April | 47.0 °F | 71.2 °F | 0.33 in. |
| May | 54.5 °F | 80.6 °F | 0.11 in. |
| June | 63.3 °F | 90.7 °F | 0.03 in. |
| July | 69.5 °F | 96.9 °F | 0.16 in. |
| August | 69.1 °F | 96.3 °F | 0.09 in. |
| September | 63.7 °F | 89.1 °F | 0.21 in. |
| October | 54.4 °F | 76.9 °F | 0.34 in. |
| November | 44.6 °F | 63.8 °F | 0.42 in. |
| December | 37.8 °F | 54.4 °F | 0.77 in. |
| Annual | 52.1 °F | 74.9 °F | 6.51 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BWh - Hot Desert Climate |