Lompico, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.8 °C (low) to 22 °C (high). Annual precipitation averages 1252.5 Millimeters. Lompico is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.5 °C | 15.3 °C | 270.76 mm |
| February | 5.1 °C | 16.2 °C | 272.29 mm |
| March | 5.7 °C | 18.3 °C | 164.85 mm |
| April | 6.4 °C | 21 °C | 67.31 mm |
| May | 8.2 °C | 23.1 °C | 29.72 mm |
| June | 9.7 °C | 26.3 °C | 7.37 mm |
| July | 11.6 °C | 28.9 °C | 0.51 mm |
| August | 11.6 °C | 29.1 °C | 1.52 mm |
| September | 11 °C | 28 °C | 4.06 mm |
| October | 8.9 °C | 24.7 °C | 51.05 mm |
| November | 6.4 °C | 18.6 °C | 110.24 mm |
| December | 4.4 °C | 14.7 °C | 272.8 mm |
| Annual | 7.8 °C | 22 °C | 1252.48 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |