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Conditions at Mavericks in December
December: XL Season At Full Roar
December is the apex of the Mavericks calendar. The average swell hits 6ft (1.9m), the period lengthens to 13.0s, and the combination of W, WNW and WSW groundswell produces the broad, powerful west-northwest exposure this reef thrives on. Offshore winds are the best of the year: ideal conditions 53% of the time, with the N/NE quadrant blowing cleanly nearly 28% of the time. The Aleutian Low is at full strength, spinning deep North Pacific storms toward California and sending heavy, XL-scale waves into Half Moon Bay. Water temp is 11.7°C, air temp 10.9°C, and 3.32 mm/day of rain keeps the air cold and raw. When the elements align, December offers the quintessential - and terrifying - Mavericks experience.
Average Spot conditions at Mavericks in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Mavericks 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 Mavericks for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Mavericks 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 Mavericks.