Tehama, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 49 °F (low) to 74.8 °F (high). Annual precipitation averages 24.9 Inches. Tehama is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.9 °F | 56.1 °F | 4.73 in. |
| February | 40.1 °F | 60.6 °F | 3.96 in. |
| March | 42.7 °F | 65.7 °F | 3.51 in. |
| April | 45.7 °F | 71.0 °F | 1.47 in. |
| May | 52.6 °F | 79.8 °F | 1.23 in. |
| June | 59.2 °F | 88.2 °F | 0.46 in. |
| July | 62.6 °F | 94.6 °F | 0.02 in. |
| August | 60.9 °F | 93.3 °F | 0.06 in. |
| September | 57.0 °F | 89.5 °F | 0.25 in. |
| October | 50.0 °F | 78.5 °F | 0.99 in. |
| November | 41.8 °F | 64.5 °F | 3.01 in. |
| December | 37.4 °F | 55.6 °F | 5.16 in. |
| Annual | 49 °F | 74.8 °F | 24.85 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |