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Conditions at Sealion Cove in December
December: Peak Season in the North Pacific
December is the crown jewel of the year at Sealion Cove. Average swell heights peak at 3.0m (9.8ft) with a long-period 11.7s, fueled by the strongest North Pacific storms of the season. The wave rose still tilts heavily toward SW (8.5%) and WSW (10.3%) - those totals don't look huge because energy is spread over larger size classes - but the W and WNW windows are the most likely they'll get all year to align with the cove's exposure. When a proper WNW groundswell fills in under offshore easterly flow, this place can be heavy, hollow and well overhead.
Ideal wind conditions hold at 40%, with E/ESE/SE/SSE winds providing plenty of clean, glassy stretches. Air temperatures are brutal - averaging -0.7°C, dipping to -21.7°C - and water sits at 6.6°C, so expect full rubber. With 7.82mm/day of precipitation, the weather is typically stormy and cold, but that's the price of admission for the best surf of the season in the Gulf of Alaska.
Average Spot conditions at Sealion Cove in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Sealion Cove 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 Sealion Cove for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sealion Cove 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 Sealion Cove.