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Conditions at Isla Chepillo in December
December: Offshore Trades Return, Swell Fades
The wet season ends and the northerly trade-wind regime re-establishes itself in December. Offshore N/NNE flow returns strongly to around 52%, and onshore south winds shrink to just 4%. The average period is 8.6s, a little punchier than November, but the wave height drops back to 0.4m (1.3ft) and almost 96% of waves are below 0.5m. The swell direction is still mostly SSW (75.3%), with SW adding 6.6% and some N/NNE energy reappearing, but there is simply not enough size to generate quality surf. Ideal conditions sit at only 1%. December offers clean, glassy water for the most part and marks the beginning of the dry, fair-weather flat season. Air temps average 26.6°C, rain decreases sharply to 3.47mm/day, and water temp cools to 27.9°C.
Average Spot conditions at Isla Chepillo in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Isla Chepillo 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 Chepillo for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Isla Chepillo 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 Chepillo.