Flournoy, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 50.8 °F (low) to 75.3 °F (high). Annual precipitation averages 23.7 Inches. 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 | 38.5 °F | 56.5 °F | 4.66 in. |
| February | 41.0 °F | 60.5 °F | 4.39 in. |
| March | 43.8 °F | 65.4 °F | 3.29 in. |
| April | 46.8 °F | 70.8 °F | 1.66 in. |
| May | 53.8 °F | 80.1 °F | 1.28 in. |
| June | 61.1 °F | 89.2 °F | 0.53 in. |
| July | 65.7 °F | 96.1 °F | 0.04 in. |
| August | 64.0 °F | 94.7 °F | 0.05 in. |
| September | 60.1 °F | 90.3 °F | 0.26 in. |
| October | 52.5 °F | 78.8 °F | 0.94 in. |
| November | 43.7 °F | 65.0 °F | 2.31 in. |
| December | 38.1 °F | 55.9 °F | 4.31 in. |
| Annual | 50.8 °F | 75.3 °F | 23.72 in. |
| 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 : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |