Lucerne, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 5.6 °C (low) to 22.8 °C (high). Annual precipitation averages 840 Millimeters. Lucerne is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.2 °C | 13 °C | 168.15 mm |
| February | 1.8 °C | 15.1 °C | 162.31 mm |
| March | 2.7 °C | 17.4 °C | 104.14 mm |
| April | 4.3 °C | 20.4 °C | 59.18 mm |
| May | 6.7 °C | 24.8 °C | 34.8 mm |
| June | 9.2 °C | 29.7 °C | 6.86 mm |
| July | 11.8 °C | 34.2 °C | 0.76 mm |
| August | 11.1 °C | 33.7 °C | 2.03 mm |
| September | 8.6 °C | 31.1 °C | 3.3 mm |
| October | 5.7 °C | 25 °C | 39.37 mm |
| November | 2.8 °C | 16.9 °C | 81.79 mm |
| December | 0.7 °C | 12.8 °C | 177.29 mm |
| Annual | 5.6 °C | 22.8 °C | 839.98 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |