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Conditions at Porth Neigwl in December
December: Peak Power
December is a heavyweight month. The average swell height matches January's peak at 8ft (2.5m), with an 11.2s average period, and the North Atlantic is often in full beast mode. W swell accounts for 16.6% of the wave rose, WSW 12.2%, WNW 7.2% and SW 6.2%. More importantly, a larger share of that energy falls in the 1.5-2.5m range, with some XL sets over 2.5m (8ft+) mixed in. But this is also a very windy month: ideal offshore E/SE wind drops back to 16%, while SW/WSW/W onshore winds dominate. Positive NAO winters can lock the UK into a conveyor belt of storms and make it hard to find a clean day; negative NAO winters often bring crisp, offshore easterlies and epic conditions. Air temp averages 10.1°C, water 11.4°C, and precipitation is 3.80mm/day. December is all about patience and timing.
Average Spot conditions at Porth Neigwl in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Porth Neigwl 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 Porth Neigwl for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Porth Neigwl 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 Porth Neigwl.