Conditions at Carrownisky in December
December: The Deep Winter Prize
December delivers the full power of the Atlantic winter. Average swell height is 6ft (1.9m), the average period is an impressive 12.3s, and the swell rose is dominated by W (21.3%), WSW (14.5%) and WNW (13.2%). There is a lot of heavy water moving through the 5-8ft (1.5-2.5m) range, and the NW/NNW components can add an extra angle to the west-facing beach. Offshore winds are scarce - ideal conditions only 14% of the time - but the reward is high when they arrive. The strongest NE/E offshore flows often follow a cold front as high pressure builds over Scandinavia, turning stormy W swells into clean, lined-up winter waves. The days are short, cold and wet: air temperatures average 7.6°C (range -2.0 to 13.3°C), precipitation is 4.87 mm/day, and water temperature sits at 9.3°C (49°F). This is charging territory for experienced surfers; December is not for the faint-hearted.
Average Spot conditions at Carrownisky in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Carrownisky 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 Carrownisky for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Carrownisky 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 Carrownisky.