Conditions at Mira in December
December: Peak Winter, Peak Potential
December is the peak of the peak. Average surf is 8ft (2.4m), average period is 12.6s, and the ideal-wind percentage hits 50 percent - the best of the entire year. Swell generation is relentless: NW swells account for 20.9 percent, WNW for 18.3 percent and west for 7.6 percent, with wave heights frequently in the pumping 1.5-2.5m range and a growing share above 2.5m. The wind regime is the real key: east winds are the most common directional category at 12.8 percent, with ESE (7.7 percent) and SE (7.8 percent) adding to an offshore-friendly pattern. Water temp has fallen to 14.3C (58F), air temps average 11.1C (52F), and precipitation is substantial at 3.99mm/day. December combines the longest periods, the strongest swell and the cleanest winds, so when it all aligns, Mira is as good as it gets.
Average Spot conditions at Mira in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Mira 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 Mira for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Mira 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 Mira.