Courtland, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9 °C (low) to 22.8 °C (high). Annual precipitation averages 464.8 Millimeters. 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 | 3.8 °C | 13.1 °C | 95 mm |
| February | 5 °C | 15.8 °C | 88.9 mm |
| March | 6.6 °C | 18.7 °C | 67.56 mm |
| April | 8.1 °C | 21.3 °C | 33.53 mm |
| May | 10.8 °C | 25.4 °C | 17.27 mm |
| June | 13.2 °C | 29.2 °C | 5.33 mm |
| July | 14.4 °C | 31.6 °C | 0 mm |
| August | 14.3 °C | 31.4 °C | 0.76 mm |
| September | 12.9 °C | 30.1 °C | 2.54 mm |
| October | 9.7 °C | 25.3 °C | 21.84 mm |
| November | 5.4 °C | 18.2 °C | 44.45 mm |
| December | 3.3 °C | 13.2 °C | 87.63 mm |
| Annual | 9 °C | 22.8 °C | 464.81 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |