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Conditions at Rincon Point in December
December: Long-Period Winter Pulses
December delivers some of the best winter combinations of the year. Average swell height is 3-4ft (1.1m) and the period jumps to 12.1s, giving Rincon a powerful, long-period foundation. The swell direction is slightly more WNW dominant - W at 39.2% and WNW at 45.0% - but the southern window remains at around 4.2%. Cool-season winds are ideal 46% of the time, with N, NNE, NE, and NNW directions all featuring prominently. The Aleutian Low becomes a major player, sending consistent mixed groundswell into the Channel Islands, while Great Basin high pressure supplies offshore N/NE winds. This is prime time for hollow, lined-up point waves.
Winter fully arrives with average air temperature 9.0°C, water temperature 14.2°C, and precipitation 1.97 mm/day. As the calendar winds down, the pattern strongly favors Rincon - long-period energy and the most reliable offshore wind window of the year.
Average Spot conditions at Rincon Point in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Rincon Point 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 Rincon Point for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Rincon Point 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 Rincon Point.