Long Barn, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 43 °F (low) to 64.3 °F (high). Annual precipitation averages 44.7 Inches. 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 | 32.8 °F | 49.3 °F | 7.81 in. |
| February | 31.9 °F | 49.5 °F | 7.36 in. |
| March | 33.8 °F | 53.3 °F | 6.4 in. |
| April | 36.5 °F | 57.6 °F | 3.97 in. |
| May | 43.6 °F | 66.3 °F | 2.64 in. |
| June | 51.7 °F | 76.5 °F | 0.71 in. |
| July | 59.0 °F | 84.9 °F | 0.21 in. |
| August | 58.3 °F | 84.5 °F | 0.14 in. |
| September | 53.5 °F | 78.2 °F | 0.54 in. |
| October | 45.4 °F | 67.4 °F | 2.49 in. |
| November | 37.3 °F | 55.6 °F | 4.48 in. |
| December | 32.0 °F | 47.9 °F | 7.93 in. |
| Annual | 43 °F | 64.3 °F | 44.68 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |