Conditions at Haleiwa in December
December: Peak Winter and Maximum Power
December, along with January, sits at the peak of Haleiwa's calendar. The average swell height is back up to 9ft (2.7m), the average period is 12.4s, and the North Pacific is sending organized, long-period groundswell across the entire northwest fetch. NNW is the dominant swell direction at 14.1%, with N at 4.1% and NW at 4.1%. There is still a substantial NNE component at 7.9%, but the biggest, most powerful waves clearly have a northwest signature and will wrap, peak, and barrel at Haleiwa.
Wind statistics show ideal offshore flow 40% of the time, often thanks to Kona winds and post-frontal south to southwest conditions. When this synoptic setup coincides with the larger NNW swells, all of Haleiwa's famous reef peaks switch on. Water temperatures remain comfortable at 25.0°C, air temperatures average 23.6°C, and December is one of the wetter months with 2.29mm/day of rainfall. If you want maximum Haleiwa, this is it.
Average Spot conditions at Haleiwa in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Haleiwa 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 Haleiwa for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Haleiwa 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 Haleiwa.