Conditions at Rosa in December
December: Summer Slop and Warm Water
December rounds out the year in full summer mode. The average swell height is 1.2m (4ft), the average period is 8.1s, and the wave rose is once again dominated by E (25%), ESE (21%), ENE (21%) and SE (15%). Most of the energy sits in the 0.5-1m (2-3ft) and 1-1.5m (3-5ft) classes, with only a trace of bigger surf. It is groveling territory, though the right bank can still offer fun little runners.
The wind is not on your side. Ideal conditions are just 23%, with NNE (21%) and NE (21%) leading the charge and a persistent flow of ENE (9%) and E (5%) adding onshore texture. SSW (9%) and SW (6%) provide only occasional relief. Water temperature climbs to 23.6°C, air averages 22.6°C, and rainfall picks up to 5.14 mm/day. December is best for warm-water soft-top sessions and dawn patrols - the serious swells are still a few months away.
Average Spot conditions at Rosa in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Rosa 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 Rosa for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Rosa 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 Rosa.