North San Juan, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.5 °F (low) to 71.7 °F (high). Annual precipitation averages 47.3 Inches. North San Juan is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.4 °F | 55.3 °F | 8.38 in. |
| February | 36.8 °F | 56.7 °F | 7.67 in. |
| March | 39.1 °F | 60.6 °F | 7.33 in. |
| April | 41.9 °F | 65.9 °F | 4.04 in. |
| May | 48.3 °F | 74.6 °F | 2.32 in. |
| June | 54.6 °F | 84.4 °F | 0.67 in. |
| July | 60.5 °F | 92.6 °F | 0.04 in. |
| August | 60.0 °F | 92.0 °F | 0.12 in. |
| September | 55.4 °F | 87.2 °F | 0.43 in. |
| October | 48.1 °F | 76.0 °F | 2.29 in. |
| November | 40.4 °F | 61.7 °F | 4.65 in. |
| December | 35.9 °F | 53.9 °F | 9.36 in. |
| Annual | 46.5 °F | 71.7 °F | 47.3 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |