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Conditions at Isla Grande in December
December: Winter Power Returns, Wind Too
December signals the return of serious winter swell. The average wave height jumps to 1.7m (5.5ft) with an 8.0s period, and NE swell supplies 80.9% of the energy - a solid pulse for the coast. Unfortunately, the trade winds also come back with a vengeance: NE wind blows 45.8%, NNE 22.1%, and ENE 12.3%, leaving only around 7% ideal offshore wind. This is a classic winter pattern: plenty of size, plenty of chop. Rare southwesterly gusts behind passing fronts can unlock the spot's potential, but they're fleeting. Water temp remains warm at 28.2°C and rainfall drops to 3.79 mm/day as the dry season begins. Look for the lulls between trade wind events to find the magic.
Average Spot conditions at Isla Grande in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Isla Grande 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 Isla Grande for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Isla Grande 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 Isla Grande.