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Conditions at Seal Beach in December
December: Prime Time for Clean Winter Waves
December is arguably the most consistent month of the year at Seal Beach. The average swell height is 2-3ft (0.8m) with a 12.3s period, and the winter west-swell machine is in full swing: W 42.6%, WSW 33.4%, SW 16.0%, WNW 2.4%. The story here is the wind: ideal conditions peak at 50% of the time, the highest of any month. NE (17.7%), ENE (10.1%), NNE (6.2%) and N (1.7%) flow keep the lineup much cleaner than summer, while any bigger 3-5ft (1-1.5m) west groundswell wraps nicely into the SSW-facing sandbars. When high pressure slides over the West and sets up Santa Ana winds, Seal Beach can have glassy head-high waves with zero onshore texture - some of the most fun wave quality of the year. Average precip rises to 1.86 mm/day, air temps cool to 14.8°C, and water temp is 14.9°C, so you'll want at least a 4/3 for those dawn missions.
Average Spot conditions at Seal Beach in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Seal 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 Seal Beach for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Seal 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 Seal Beach.