Cartago, California has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 7.3 °C (low) to 24.4 °C (high). Annual precipitation averages 131.6 Millimeters. Cartago is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.8 °C | 12.8 °C | 27.94 mm |
| February | 0.2 °C | 14.9 °C | 25.65 mm |
| March | 3 °C | 18.8 °C | 14.99 mm |
| April | 5.8 °C | 23.1 °C | 4.32 mm |
| May | 10.6 °C | 27.9 °C | 4.06 mm |
| June | 15 °C | 33.5 °C | 3.81 mm |
| July | 18.1 °C | 37.1 °C | 5.59 mm |
| August | 17.3 °C | 36.6 °C | 3.05 mm |
| September | 13.6 °C | 32.7 °C | 3.81 mm |
| October | 7.8 °C | 25.8 °C | 6.6 mm |
| November | 1.2 °C | 17.9 °C | 7.62 mm |
| December | -3.2 °C | 12.1 °C | 24.13 mm |
| Annual | 7.3 °C | 24.4 °C | 131.57 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BWh - Hot Desert Climate |