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Conditions at Black Rock in December
December: The Summer Lull Settles In
December completes the journey into the summer low season. Average swell height sits at 5ft (1.6m), average wave period is a modest 8.2s, and true W/SW-directed swell accounts for barely one percent of the total energy. The swell rose is dominated by SSE (17.0 percent), ENE (15.5 percent), NE (14.6 percent), E (12.5 percent) and SE (13.4 percent), none of which are ideal for Black Rock. The wind data, however, are the best of the year: NNE blows 17.0 percent, NE 14.5 percent, and the ideal-wind score reaches 31 percent. Water temperature warms to 20.8°C, air temperatures average 20.6°C, and daily precipitation is around 2.37 mm/day. It is a month of pleasant, clean, fun-sized surf rather than heavy groundswell - perfect for a summer cruise, but unlikely to produce the epic, powerful days Black Rock is known for in winter.
Average Spot conditions at Black Rock in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Black Rock 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 Black Rock for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Black Rock 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 Black Rock.