Montague, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 37.9 °F (low) to 67.4 °F (high). Annual precipitation averages 16.3 Inches. Montague is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.2 °F | 46.5 °F | 2.6 in. |
| February | 28.6 °F | 51.7 °F | 1.89 in. |
| March | 31.2 °F | 57.2 °F | 1.48 in. |
| April | 34.8 °F | 63.2 °F | 1.16 in. |
| May | 41.2 °F | 72.9 °F | 1.19 in. |
| June | 46.6 °F | 81.7 °F | 0.68 in. |
| July | 53.4 °F | 92.1 °F | 0.41 in. |
| August | 52.2 °F | 91.4 °F | 0.34 in. |
| September | 45.7 °F | 84.0 °F | 0.33 in. |
| October | 36.8 °F | 69.7 °F | 1.07 in. |
| November | 30.6 °F | 53.8 °F | 2.01 in. |
| December | 27.0 °F | 45.1 °F | 3.17 in. |
| Annual | 37.9 °F | 67.4 °F | 16.33 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°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 |