Conditions at Big Rock in December
December: Power Without Polish
December delivers the biggest average swell of the year at 1.2m (4ft), with ENE and E swells feeding directly into the exposure. The 3-5ft (1-1.5m) band dominates, and there is even a meaningful 13% of waves in the 5-8ft (1.5-2.5m) range. This is the best wave height and swell direction combination Big Rock sees all year. Unfortunately, the wind is even worse than November: NE and NNE winds combine for 71% of all observations, ENE adds 10%, and ideal offshore wind time bottoms out at just 4%. The average period collapses to 6.9s, meaning short, choppy, onshore windswell. December is the definition of frustration - there is power in the water but almost no clean surface to ride it. Air temps are 24.2°C, water temp 27.0°C, and rainfall eases to 4.54mm/day. If you score a rare morning of offshore land breeze, it can be epic; just be prepared for many blown-out days in between.
Average Spot conditions at Big Rock in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Big Rock 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 Big Rock for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Big Rock 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 Big Rock.