Red Bluff, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.7 °C (low) to 23.7 °C (high). Annual precipitation averages 647.4 Millimeters. Red Bluff is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.3 °C | 13.4 °C | 128.52 mm |
| February | 4.5 °C | 15.7 °C | 118.11 mm |
| March | 6.1 °C | 18.5 °C | 83.06 mm |
| April | 7.8 °C | 21.3 °C | 42.93 mm |
| May | 11.7 °C | 26.2 °C | 31.75 mm |
| June | 15.6 °C | 31.5 °C | 13.72 mm |
| July | 17.6 °C | 35.2 °C | 1.27 mm |
| August | 16.5 °C | 34.4 °C | 1.52 mm |
| September | 14.3 °C | 31.9 °C | 6.35 mm |
| October | 10.2 °C | 25.6 °C | 30.73 mm |
| November | 5.6 °C | 18 °C | 66.04 mm |
| December | 3.1 °C | 13 °C | 123.44 mm |
| Annual | 9.7 °C | 23.7 °C | 647.44 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| 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 |