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Conditions at Morro dos Conventos in December
December: Summer Returns
December locks Morro dos Conventos back into the summer tradewind rhythm. Average height settles around 4-5ft (1.4m), average period drops to 8.5s, and the swell rose is dominated by E/ESE windswell - 25.2% from E and 21.7% from ESE. These are fun, grovel-friendly waves in the 1-1.5m range, but the long-period south groundswell that made autumn special has largely vanished from the charts.
The wind regime is typical of Santa Catarina summer: NE/ENE trades dominate (27.6% + 17.8%), and ideal offshore time is only 16%. When a summer cold front or coastal low sneaks through, the W/NW offshore can still produce a sneaky good session, but day-to-day conditions are more about punchy average-period peaks than epic walls. Water warms to 21.7°C, air temps hit 22.9°C, and the summer crowds will be out regardless. Bring a small board and a positive mindset.
Average Spot conditions at Morro dos Conventos in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Morro dos Conventos 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 Morro dos Conventos for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Morro dos Conventos 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 Morro dos Conventos.