Almanor, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 0.9 °C (low) to 17 °C (high). Annual precipitation averages 915.4 Millimeters. Almanor is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 6.4 °C | 141.22 mm |
| February | -4.6 °C | 8.2 °C | 150.62 mm |
| March | -2.7 °C | 10.9 °C | 129.79 mm |
| April | -0.8 °C | 13.9 °C | 72.9 mm |
| May | 2.7 °C | 19.3 °C | 46.23 mm |
| June | 6.1 °C | 24.9 °C | 19.56 mm |
| July | 8.9 °C | 29.8 °C | 10.67 mm |
| August | 8.3 °C | 29.3 °C | 9.65 mm |
| September | 5.2 °C | 25.9 °C | 11.94 mm |
| October | 0.9 °C | 18.7 °C | 46.48 mm |
| November | -2.4 °C | 10.6 °C | 101.35 mm |
| December | -5.1 °C | 5.8 °C | 175.01 mm |
| Annual | 0.9 °C | 17 °C | 915.42 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |