Conditions at Mejillones in December
December: Peak Season, Maximum Size and Offshore Hope
December is arguably the best month of the year for Mejillones. Average swell height is 2.1m (7ft), average period is 12.6s, and the swell rose remains full from the NNW (31.0 percent), NW (19.2 percent), N (8.1 percent) and WNW (8.1 percent). The most important stat, however, is wind: ideal surf wind peaks at 23 percent-by far the highest of the year. While NE/ENE winds still dominate, the south to southwest flow (S, SSW, SW, WSW) appears more consistently, blowing directly offshore for this NNW-facing beach. Water temperature is 20.2°C, air temps average 18.9°C and precipitation is higher (0.65mm/day), all signs of a stormy, active winter pattern. The combination of long-period, powerful swell and a real chance of offshore wind makes December the month to circle on the calendar. When the North Atlantic is angry and Mejillones is clean, the wave quality is world class.
Average Spot conditions at Mejillones in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Mejillones 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 Mejillones for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Mejillones 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 Mejillones.