Cartago, California has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 45.1 °F (low) to 76 °F (high). Annual precipitation averages 5.2 Inches. 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 | 28.8 °F | 55.1 °F | 1.1 in. |
| February | 32.3 °F | 58.9 °F | 1.01 in. |
| March | 37.4 °F | 65.9 °F | 0.59 in. |
| April | 42.5 °F | 73.6 °F | 0.17 in. |
| May | 51.0 °F | 82.2 °F | 0.16 in. |
| June | 59.0 °F | 92.3 °F | 0.15 in. |
| July | 64.6 °F | 98.7 °F | 0.22 in. |
| August | 63.2 °F | 97.8 °F | 0.12 in. |
| September | 56.4 °F | 90.8 °F | 0.15 in. |
| October | 46.0 °F | 78.4 °F | 0.26 in. |
| November | 34.1 °F | 64.3 °F | 0.3 in. |
| December | 26.2 °F | 53.7 °F | 0.95 in. |
| Annual | 45.1 °F | 76 °F | 5.18 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BWh - Hot Desert Climate |