Loomis, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.5 °C (low) to 23.8 °C (high). Annual precipitation averages 671.3 Millimeters. Loomis is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.8 °C | 13.2 °C | 123.19 mm |
| February | 4.9 °C | 15.8 °C | 118.11 mm |
| March | 6.5 °C | 18.4 °C | 98.3 mm |
| April | 7.8 °C | 21.7 °C | 53.59 mm |
| May | 10.9 °C | 26.4 °C | 37.34 mm |
| June | 14.1 °C | 31.3 °C | 7.87 mm |
| July | 16.3 °C | 35 °C | 0.25 mm |
| August | 15.9 °C | 34.6 °C | 1.02 mm |
| September | 13.9 °C | 31.7 °C | 4.32 mm |
| October | 10.2 °C | 25.8 °C | 34.04 mm |
| November | 6 °C | 18.1 °C | 69.34 mm |
| December | 3.5 °C | 13.3 °C | 123.95 mm |
| Annual | 9.5 °C | 23.8 °C | 671.32 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |