Long Barn, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 6.1 °C (low) to 17.9 °C (high). Annual precipitation averages 1134.9 Millimeters. Long Barn is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.4 °C | 9.6 °C | 198.37 mm |
| February | -0.1 °C | 9.7 °C | 186.94 mm |
| March | 1 °C | 11.8 °C | 162.56 mm |
| April | 2.5 °C | 14.2 °C | 100.84 mm |
| May | 6.4 °C | 19.1 °C | 67.06 mm |
| June | 10.9 °C | 24.7 °C | 18.03 mm |
| July | 15 °C | 29.4 °C | 5.33 mm |
| August | 14.6 °C | 29.2 °C | 3.56 mm |
| September | 11.9 °C | 25.7 °C | 13.72 mm |
| October | 7.4 °C | 19.7 °C | 63.25 mm |
| November | 2.9 °C | 13.1 °C | 113.79 mm |
| December | 0 °C | 8.8 °C | 201.42 mm |
| Annual | 6.1 °C | 17.9 °C | 1134.87 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |