Long Beach, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 45.3 °F (low) to 57.8 °F (high). Annual precipitation averages 78.5 Inches. Long Beach is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.9 °F | 49.2 °F | 12.05 in. |
| February | 38.7 °F | 50.8 °F | 7.73 in. |
| March | 40.7 °F | 52.9 °F | 8.62 in. |
| April | 41.6 °F | 55.4 °F | 6.59 in. |
| May | 46.6 °F | 59.5 °F | 3.75 in. |
| June | 49.8 °F | 62.1 °F | 2.67 in. |
| July | 54.1 °F | 65.8 °F | 1.04 in. |
| August | 53.3 °F | 67.0 °F | 1.61 in. |
| September | 51.7 °F | 66.8 °F | 2.59 in. |
| October | 46.5 °F | 60.8 °F | 7.63 in. |
| November | 42.9 °F | 53.8 °F | 11.85 in. |
| December | 38.4 °F | 48.9 °F | 12.35 in. |
| Annual | 45.3 °F | 57.8 °F | 78.48 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |