Fillmore, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 10.1 °C (low) to 24.1 °C (high). Annual precipitation averages 490.2 Millimeters. Fillmore is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.8 °C | 19.2 °C | 117.35 mm |
| February | 6.7 °C | 19.2 °C | 126.24 mm |
| March | 7.6 °C | 20.2 °C | 78.99 mm |
| April | 8.3 °C | 22.3 °C | 21.34 mm |
| May | 10.4 °C | 23.8 °C | 10.41 mm |
| June | 12.2 °C | 26.2 °C | 1.02 mm |
| July | 14.2 °C | 29.6 °C | 1.27 mm |
| August | 14.4 °C | 30.7 °C | 0 mm |
| September | 13.6 °C | 29.9 °C | 2.54 mm |
| October | 11.6 °C | 26.9 °C | 20.83 mm |
| November | 8.6 °C | 22.5 °C | 31.24 mm |
| December | 6.3 °C | 18.9 °C | 78.99 mm |
| Annual | 10.1 °C | 24.1 °C | 490.22 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |