Wasco, California has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 49.5 °F (low) to 77.4 °F (high). Annual precipitation averages 6.8 Inches. Wasco is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.1 °F | 57.3 °F | 1.4 in. |
| February | 39.8 °F | 63.2 °F | 1.3 in. |
| March | 43.6 °F | 69.2 °F | 1.26 in. |
| April | 46.9 °F | 75.1 °F | 0.56 in. |
| May | 53.6 °F | 83.3 °F | 0.23 in. |
| June | 59.5 °F | 91.4 °F | 0.06 in. |
| July | 65.0 °F | 97.0 °F | 0.0 in. |
| August | 63.4 °F | 96.2 °F | 0.0 in. |
| September | 58.8 °F | 91.2 °F | 0.03 in. |
| October | 49.9 °F | 80.6 °F | 0.3 in. |
| November | 40.9 °F | 66.8 °F | 0.58 in. |
| December | 35.3 °F | 57.4 °F | 1.12 in. |
| Annual | 49.5 °F | 77.4 °F | 6.84 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 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 | BWk - Cold Desert Climate |