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Conditions at El Muro in December
December: Summer Onshore Blender
December closes the year with the average swell back down to around 5ft (1.6m), though the period stays long at 13.1 seconds. The swell mix splits nearly evenly between SW (59.1%) and WSW (37.6%), so the west-facing sandbars still receive consistent, head-high-plus long-period groundswell. The killer is the surface wind: ideal offshore flow is 0%, and SSW, SW, WSW and W combine for over 90% of observations. The thermal SW wind kicks in almost every afternoon, making the rideable window essentially dawn-and even then, the surface is often marginal.
Water temp warms to 14.1°C, air temps average 18.7°C, and rainfall is a dry 0.02 mm/day. The patience needs to be endless.
Average Spot conditions at El Muro in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at El Muro 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 El Muro for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at El Muro 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 El Muro.