Mount Shasta, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 36.9 °F (low) to 63.9 °F (high). Annual precipitation averages 42.2 Inches. Mount Shasta is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.2 °F | 45.0 °F | 6.24 in. |
| February | 28.3 °F | 48.3 °F | 6.06 in. |
| March | 30.6 °F | 53.1 °F | 6.02 in. |
| April | 33.7 °F | 59.1 °F | 3.96 in. |
| May | 39.9 °F | 68.7 °F | 2.22 in. |
| June | 45.8 °F | 77.3 °F | 1.38 in. |
| July | 50.8 °F | 87.1 °F | 0.55 in. |
| August | 49.2 °F | 86.4 °F | 0.25 in. |
| September | 43.7 °F | 79.8 °F | 0.61 in. |
| October | 36.6 °F | 66.3 °F | 2.27 in. |
| November | 30.8 °F | 51.8 °F | 4.74 in. |
| December | 26.6 °F | 43.4 °F | 7.87 in. |
| Annual | 36.9 °F | 63.9 °F | 42.17 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |