Mount Shasta, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 2.7 °C (low) to 17.7 °C (high). Annual precipitation averages 1071.1 Millimeters. 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 | -2.7 °C | 7.2 °C | 158.5 mm |
| February | -2.1 °C | 9.1 °C | 153.92 mm |
| March | -0.8 °C | 11.7 °C | 152.91 mm |
| April | 0.9 °C | 15.1 °C | 100.58 mm |
| May | 4.4 °C | 20.4 °C | 56.39 mm |
| June | 7.7 °C | 25.2 °C | 35.05 mm |
| July | 10.4 °C | 30.6 °C | 13.97 mm |
| August | 9.6 °C | 30.2 °C | 6.35 mm |
| September | 6.5 °C | 26.6 °C | 15.49 mm |
| October | 2.6 °C | 19.1 °C | 57.66 mm |
| November | -0.7 °C | 11 °C | 120.4 mm |
| December | -3 °C | 6.3 °C | 199.9 mm |
| Annual | 2.7 °C | 17.7 °C | 1071.12 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |