Conditions at Katagai in December
December: Peak Offshore Consistency and Winter Pulse
December is the crown jewel for Katagai. Offshore wind blows a huge 48 percent of the time - the highest of the year - thanks to the fully established Siberian High pumping NNW and NW winds across the Japanese landmass. Surf height averages 1.2m (4ft) but with periods around 9.4s, and the dominant ENE/NE/E/ESE swells deliver plenty of punch to the ESE-facing beach. The atmosphere turns colder, with air temps around 11.3°C and water temps falling to 15.5°C, but the trade-off is stellar: glassy, lined-up winter surf at one of the most consistent spots on the coast. If you are planning a strike mission, December is the month to be there.
Average Spot conditions at Katagai in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Katagai 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 Katagai for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Katagai 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 Katagai.