Courtland, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 48.1 °F (low) to 73 °F (high). Annual precipitation averages 18.3 Inches. Courtland is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.8 °F | 55.5 °F | 3.74 in. |
| February | 41.0 °F | 60.5 °F | 3.5 in. |
| March | 43.9 °F | 65.6 °F | 2.66 in. |
| April | 46.5 °F | 70.4 °F | 1.32 in. |
| May | 51.5 °F | 77.7 °F | 0.68 in. |
| June | 55.7 °F | 84.6 °F | 0.21 in. |
| July | 57.9 °F | 88.8 °F | 0.0 in. |
| August | 57.8 °F | 88.6 °F | 0.03 in. |
| September | 55.3 °F | 86.2 °F | 0.1 in. |
| October | 49.4 °F | 77.5 °F | 0.86 in. |
| November | 41.8 °F | 64.7 °F | 1.75 in. |
| December | 38.0 °F | 55.7 °F | 3.45 in. |
| Annual | 48.1 °F | 73 °F | 18.3 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |