Conditions at Praia da Vieira in December
December: Midwinter Gold at the End of the Year
December closes the year with near-peak winter conditions. The average swell height is 7-8ft (2.1-2.4m) and the average period is 12.7s, making it one of the most consistent months of the year. The swell distribution is nicely balanced between NW (24.1%), WNW (20.6%) and W (8.0%), with WSW also beginning to appear-all of them good angles for this open stretch of coast. Importantly, the ideal offshore wind percentage ties January's 37%, and the wind data shows a clear increase in ESE and SE flow (11.2% and 10.9% respectively), which means clean, offshore-enforced conditions are a real possibility between winter cold fronts. Air temps average 10.5°C, water drops to 14.5°C, and precipitation is high at 3.55 mm/day. This is the real deal: powerful, long-period groundswell, offshore winds, and classic winter atmosphere on the Portuguese coast.
Average Spot conditions at Praia da Vieira in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Praia da Vieira 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 Vieira for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Praia da Vieira 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 Vieira.