Floriston, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from -1.3 °C (low) to 16.8 °C (high). Annual precipitation averages 554.5 Millimeters. Floriston is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 6.2 °C | 95.5 mm |
| February | -7 °C | 7.9 °C | 90.68 mm |
| March | -4.5 °C | 10.6 °C | 80.01 mm |
| April | -2.5 °C | 13.8 °C | 39.37 mm |
| May | 1 °C | 18.8 °C | 20.07 mm |
| June | 3.7 °C | 24.2 °C | 11.43 mm |
| July | 6.9 °C | 29.5 °C | 5.84 mm |
| August | 5.9 °C | 28.9 °C | 5.59 mm |
| September | 2.8 °C | 25.2 °C | 9.4 mm |
| October | -1.2 °C | 18.8 °C | 42.42 mm |
| November | -5.2 °C | 11.4 °C | 50.8 mm |
| December | -7.8 °C | 5.8 °C | 103.38 mm |
| Annual | -1.3 °C | 16.8 °C | 554.49 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |