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Conditions at Blacks Beach in December
December: Winter Officially Arrives
December is the pinnacle of the surf year at Blacks Beach, tied with January for the most consistent conditions. The average swell height is 1.0m (3.3ft), and the average period is a solid 12.6s. The wave rose is dominated by west swell at 54.6 percent, with WSW at 28.9 percent and WNW at 2.7 percent - giving the west-facing break maximum exposure to the North Pacific storm track. The wind data is even better: ideal offshore flow reaches a year-high 50 percent, with strong ENE, E and ESE winds blowing clean off the land. Onshore W and WNW winds are at their lowest percentages of the year (10.7 percent and 11.6 percent). Water temps sit at 15.5°C (60°F), air temps are cool at 14.8°C (58.5°F), and precipitation is 1.71 mm/day. December delivers the full winter package - powerful groundswell, offshore mornings, and the kind of hollow, rippable waves that have made Blacks Beach a California legend.
Average Spot conditions at Blacks Beach in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Blacks Beach during December. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Blacks Beach for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Blacks Beach for December. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Blacks Beach.