Conditions at Bico in December
December: Peak Season Shines Bright
December is the crown jewel of Bico's surf calendar. Average swell height is 1.9m (around 6ft), the period is a solid 12.6s, and the swell mix features a healthy blend of W (11%), WNW (28%), and NW (26%). More importantly, the wind gods cooperate: 42% of conditions are ideal - the highest of the year - with offshore easterly/southeasterly winds frequently grooming the surface under clear winter skies.
NNW onshore wind drops to just 14%, the lowest of any month, meaning Bico's northwest-facing sandbar is often clean and well-ordered. Air temps are cool at 13.8°C, water temps average 15.6°C, and rain is abundant at 2.67 mm/day - but when the sun breaks through between storms, the surf can be world-class. Winter lows marching across the Atlantic deliver consistent, powerful swell, and December offers the best overall balance of wave size, period, and offshore wind. This is the month to plan a strike mission to Bico.
Average Spot conditions at Bico in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Bico 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 Bico for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Bico 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 Bico.