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Conditions at Praia da Cal in December
December: Early Summer Lull Sets In
December brings the onset of summer and a return to smaller, punchier surf. Average height drops to 4-5ft (1.2-1.5m), period shortens to 8.2s, and ideal wind falls to 28%. Swell still arrives from a broad easterly window - ENE (22.1%), E (22.8%), ESE (17.0%), SE (13.6%), SSE (11.9%) and S (8.2%) - but the energy is less powerful and more windswell-influenced. The NE trade regime (NE 19.4%, ENE 16.0%, NNE 12.0%) takes over, and offshore W/WNW/NW/NNW flow only accounts for about 9% of the time. As a result, most days are average, rippable and slightly onshore, with the occasional clean early morning before the sea breeze kicks in. Water is warm at 22.1°C, air 21.3°C, and rain is moderate at 4.13 mm/day. It's still plenty of fun if you're frothing, but this is not the Cal of the winter months.
Average Spot conditions at Praia da Cal in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Praia da Cal 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 Praia da Cal for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Praia da Cal 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 Praia da Cal.