Rancho Tehama Reserve, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 10 °C (low) to 24 °C (high). Annual precipitation averages 657.1 Millimeters. Rancho Tehama Reserve is located in USDA Plant Hardiness Zone 9b. 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 | 13.6 °C | 129.54 mm |
| February | 4.7 °C | 15.8 °C | 114.81 mm |
| March | 6.2 °C | 18.6 °C | 90.93 mm |
| April | 7.9 °C | 21.4 °C | 44.2 mm |
| May | 11.7 °C | 26.6 °C | 31.5 mm |
| June | 15.8 °C | 31.8 °C | 15.49 mm |
| July | 18.2 °C | 35.7 °C | 1.27 mm |
| August | 17.2 °C | 34.9 °C | 2.03 mm |
| September | 14.9 °C | 32.4 °C | 7.62 mm |
| October | 10.7 °C | 25.9 °C | 28.45 mm |
| November | 6 °C | 18.3 °C | 68.33 mm |
| December | 3.2 °C | 13.3 °C | 122.94 mm |
| Annual | 10 °C | 24 °C | 657.11 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 9b : -3.9°C to -1.1°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 |