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Conditions at Portrush in December
December: Year-End Dynamite
December brings the North Atlantic's winter pedigree to Portrush. Average swell height sits around 7ft (2.1m) with a solid 11.0s period, and the directional data shows W at 17.2%, WNW at 15.1%, WSW at 7.9% and NW at 6.3%. Every deep low between Greenland and the Bay of Biscay sends groundswell toward this beach. The ideal offshore wind factor remains low at 9%, with SSW, SW and S winds dominating the surface flow. When the wind does clock into the E/SE, the combination of 10-14s period and 6-8ft (1.8-2.4m) swell can be genuinely charging.
Winter is in full force: air temps average 5.2°C, water is 9.4°C and rain is plentiful at 3.72 mm/day. December is not for the faint-hearted, but it is exactly why Portrush earns its reputation in cold, raging Atlantic surf.
Average Spot conditions at Portrush in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Portrush 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 Portrush for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Portrush 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 Portrush.