Tehama, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.4 °C (low) to 23.8 °C (high). Annual precipitation averages 631.2 Millimeters. 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 | 3.3 °C | 13.4 °C | 120.14 mm |
| February | 4.5 °C | 15.9 °C | 100.58 mm |
| March | 5.9 °C | 18.7 °C | 89.15 mm |
| April | 7.6 °C | 21.7 °C | 37.34 mm |
| May | 11.4 °C | 26.6 °C | 31.24 mm |
| June | 15.1 °C | 31.2 °C | 11.68 mm |
| July | 17 °C | 34.8 °C | 0.51 mm |
| August | 16.1 °C | 34.1 °C | 1.52 mm |
| September | 13.9 °C | 31.9 °C | 6.35 mm |
| October | 10 °C | 25.8 °C | 25.15 mm |
| November | 5.4 °C | 18.1 °C | 76.45 mm |
| December | 3 °C | 13.1 °C | 131.06 mm |
| Annual | 9.4 °C | 23.8 °C | 631.17 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |