Conditions at Il Castello in December
December: Peak Season Arrives
December is the statistical peak of the year at Il Castello. Average swell height reaches 1.0m (3.3ft), the period ticks up to 5.2s, and ideal wind equals the winter max of 21%. SW (12.8%) and WSW (11.2%) lead the swell directions, but there is also a healthy contribution from SSE (10.8%) and S (8.6%). More importantly, the heavier classes are well represented: 1-1.5m (3-5ft) surf from the S/SW/WSW window is common, and the combined 1.5-2.5m (5-8ft) southwest sector reaches about 8% of the total - more than any other month. The wind rose is strongly offshore, with NNE (15.5%) and NE (14.9%) dominating, which means the surface is frequently clean. Water temperature falls to 14.6°C (58.3°F), air temperatures average 11.1°C and rain is frequent at 2.87mm/day. This is the month to circle on the calendar: the combination of bigger southwest swell and offshore NE wind gives Il Castello its best chance of a genuinely good session.
Average Spot conditions at Il Castello in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Il Castello 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 Il Castello for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Il Castello 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 Il Castello.