Flournoy, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 10.4 °C (low) to 24 °C (high). Annual precipitation averages 602.5 Millimeters. Flournoy is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.6 °C | 13.6 °C | 118.36 mm |
| February | 5 °C | 15.8 °C | 111.51 mm |
| March | 6.6 °C | 18.6 °C | 83.57 mm |
| April | 8.2 °C | 21.6 °C | 42.16 mm |
| May | 12.1 °C | 26.7 °C | 32.51 mm |
| June | 16.2 °C | 31.8 °C | 13.46 mm |
| July | 18.7 °C | 35.6 °C | 1.02 mm |
| August | 17.8 °C | 34.8 °C | 1.27 mm |
| September | 15.6 °C | 32.4 °C | 6.6 mm |
| October | 11.4 °C | 26 °C | 23.88 mm |
| November | 6.5 °C | 18.3 °C | 58.67 mm |
| December | 3.4 °C | 13.3 °C | 109.47 mm |
| Annual | 10.4 °C | 24 °C | 602.48 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |