Conditions at Costa da Caparica in December
December: Winter Prime Time-Long-Period Power and Peak Favorable Winds
December is one of the best months of the year at Costa da Caparica. Average swell height sits at 1.9m (6ft) with a commanding 12.6-second period, meaning powerful, well-organized swells arriving from the deep Atlantic. The swell rose shows a broad western exposure: WNW 28%, NW 26%, W 11%, WSW 5% and SW 3%, with the SSW quadrant also active. That variety is excellent for the beach, allowing different sandbars to handle different swell angles throughout the month. Wind wise, December matches January for the highest ideal surf wind of the year at 46%. ENE and NNE are particularly strong, and the E/NE offshore window is both common and relatively light, setting up clean, hollow conditions. As winter officially arrives, air temperatures drop to 13.8°C and water to 15.5°C, with rain at 2.67 mm/day. Expect cold mornings, thick rubber and some of the best, most consistent surf of the whole season.
Average Spot conditions at Costa da Caparica in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Costa da Caparica 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 Costa da Caparica for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Costa da Caparica 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 Costa da Caparica.