Conditions at Guethary in December
December: Peak Season, Peak Conditions
December statistically is the pinnacle of Guethary's surf season. Average wave height sits at 5-6ft (1.7m), period at 12.6s, and ideal wind occurs 50% of the time - the absolute best ratio of the year. Swell directions are ideal: WNW 39.6%, NW 32.4%, NNW 5.0% and a healthy W component of 3.8%. The height distribution shows the entire spectrum, but the centre of mass is in the 3-8ft (1-2.5m) range, with plenty of overhead-plus energy to keep the banks hollow.
The wind regime becomes a true ally in December. SSW winds at 10.5%, SW at 5.9%, WSW at 5.9% and W at 9.5% combine to groom the winter swells into clean, strong lines. Water temp is 13.4°C, air averages 9.9°C, and precipitation runs at 3.69mm/day, so it is still proper winter surfing. But when the high pressure pushes in after a low, the combination of 6ft+ (1.8m+) WNW groundswell and offshore SSW flow is as good as it gets anywhere on the Basque coast.
Average Spot conditions at Guethary in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Guethary 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 Guethary for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Guethary 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 Guethary.