Herlong, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 36.9 °F (low) to 66 °F (high). Annual precipitation averages 9.7 Inches. Herlong is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.4 °F | 43.9 °F | 1.7 in. |
| February | 26.4 °F | 48.8 °F | 1.21 in. |
| March | 30.5 °F | 56.1 °F | 1.11 in. |
| April | 34.1 °F | 62.5 °F | 0.59 in. |
| May | 41.3 °F | 71.4 °F | 0.81 in. |
| June | 47.2 °F | 81.8 °F | 0.54 in. |
| July | 54.4 °F | 91.1 °F | 0.24 in. |
| August | 52.6 °F | 89.8 °F | 0.16 in. |
| September | 46.0 °F | 81.9 °F | 0.22 in. |
| October | 36.2 °F | 68.5 °F | 0.64 in. |
| November | 27.8 °F | 53.2 °F | 0.9 in. |
| December | 22.8 °F | 43.1 °F | 1.58 in. |
| Annual | 36.9 °F | 66 °F | 9.7 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |