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Conditions at Rosie's Bay in December
December: Winter's Peak
December is the apex of winter at Rosie's Bay. Average swell height peaks at 2.6m (8.5ft) with a long, powerful 12.4s period, making it the heaviest month of the year. The direction distribution is strongly westerly, with W (19.3%), WSW (16.2%), SW (7.0%), and SSW (4.4%) lining up perfectly with the west-southwest-facing beach. This is deep, raw, open-ocean groundswell generated by violent storms in the Gulf of Alaska. Wind conditions are generous for a winter month, with ideal offshore winds blowing 44% of the time - primarily from E (14.8%) and ESE (17.4%), though as an Arctic airmass spills south it's often the offshore E/NE component that creates the clean, glassy conditions so prized at this spot. Expect a mix of pumping 2-2.5m (6.5-8ft) bombs and occasional XXL sets over 2.5m (8ft). Water temperature is a cold 8.6°C, air hovers near 5.1°C, and precipitation is substantial at 9.9mm/day. When the stars align, Rosie's Bay offers some of the most powerful, challenging waves on the coast.
Average Spot conditions at Rosie's Bay in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Rosie's Bay 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 Rosie's Bay for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Rosie's Bay 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 Rosie's Bay.