Red Bluff, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 49.4 °F (low) to 74.7 °F (high). Annual precipitation averages 25.5 Inches. 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 | 38.0 °F | 56.2 °F | 5.06 in. |
| February | 40.1 °F | 60.2 °F | 4.65 in. |
| March | 42.9 °F | 65.3 °F | 3.27 in. |
| April | 46.1 °F | 70.4 °F | 1.69 in. |
| May | 53.0 °F | 79.2 °F | 1.25 in. |
| June | 60.0 °F | 88.7 °F | 0.54 in. |
| July | 63.7 °F | 95.3 °F | 0.05 in. |
| August | 61.7 °F | 93.9 °F | 0.06 in. |
| September | 57.7 °F | 89.5 °F | 0.25 in. |
| October | 50.3 °F | 78.0 °F | 1.21 in. |
| November | 42.0 °F | 64.4 °F | 2.6 in. |
| December | 37.6 °F | 55.4 °F | 4.86 in. |
| Annual | 49.4 °F | 74.7 °F | 25.49 in. |
| 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 : 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 |