Conditions at Thorli in December
December: Winter's Dark Fury
December is Thorli at its most extreme. Average swell height reaches 10-11ft (3.3m), the average period is a powerful 11.2 seconds, and the North Atlantic is in full storm mode. The onshore winds are relentless, however, with NE (13.3%), NNE (12.4%) and NNW (9.4%) at the front of the wind rose; ideal offshore flow only appears 13 percent of the time. The favorable east-southeast window accounts for 8.5 percent of the wave rose, with SE (3.7%) and ESE (2.2%) as the main sources. When those directions align with a westerly offshore breeze, Thorli has the potential to hold XXL, charging waves in near-freezing air. More often than not, though, December is a battle with wind and ice: air temps average -1.1°C, water temps sit at 6.0°C, and precipitation falls at 5.77 mm/day. This is a month for the committed, heavily hooded surfer who is ready to pick off the rare December gem.
Average Spot conditions at Thorli in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Thorli 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 Thorli for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Thorli 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 Thorli.