Conditions at Belharra in December
December: The Crown Jewel
December is statistically the best month of the year for Belharra. Average swell height is 6-7ft (2.0m), average period is 12.4s, and ideal wind percentage peaks at 39% - the highest of any month. The swell rose is packed with long-period NW (28.1%) and WNW (24.4%) groundswell, backed by NNW (8.5%), and the height distribution is beautifully spread from 3ft up to over 8ft (1m to 2.5m+). The wind climatology is the real star: S winds are the most frequent direction at 15.2%, with SSW at 10.9% and SSE at 6.6%, giving the spot exactly the offshore flow it needs to hold its shape. Rain averages 3.69mm/day and water temps drop to 14°C, so conditions are raw, but the payoff is massive. When a big low pressure system explodes in the Atlantic and the jet stream points at the Bay of Biscay, December can serve up the biggest, heaviest, most spectacular Belharra swells of the year.
Average Spot conditions at Belharra in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Belharra 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 Belharra for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Belharra 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 Belharra.