North San Juan, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8 °C (low) to 22.1 °C (high). Annual precipitation averages 1201.4 Millimeters. 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 | 2.4 °C | 12.9 °C | 212.85 mm |
| February | 2.7 °C | 13.7 °C | 194.82 mm |
| March | 3.9 °C | 15.9 °C | 186.18 mm |
| April | 5.5 °C | 18.8 °C | 102.62 mm |
| May | 9.1 °C | 23.7 °C | 58.93 mm |
| June | 12.6 °C | 29.1 °C | 17.02 mm |
| July | 15.8 °C | 33.7 °C | 1.02 mm |
| August | 15.6 °C | 33.3 °C | 3.05 mm |
| September | 13 °C | 30.7 °C | 10.92 mm |
| October | 8.9 °C | 24.4 °C | 58.17 mm |
| November | 4.7 °C | 16.5 °C | 118.11 mm |
| December | 2.2 °C | 12.2 °C | 237.74 mm |
| Annual | 8 °C | 22.1 °C | 1201.43 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |