Conditions at Impossibles in December
December: Monsoon's Return
December sees the northwest monsoon re-establish itself across Indonesia. The average swell is 5.2ft (1.6m) with the period dropping to 12.7s, and the direction is still dominated by SSW (57%) and SW (36.5%). The issue is the wind: W flow jumps to 28.1%, WSW to 19%, WNW to 9.3%, and onshore N/NW directions appear again. Ideal wind plummets to 34%. The combination of plenty of swell and increasingly onshore flow yields lumpy, bumpy surf for much of the month, punctuated by short windows of inline SW wind when the monsoon's intensity waxes and wanes. Rainfall rises to 7.59mm/day, water temperature is a warm 29.3°C, and air temps average 27.9°C. It's a far cry from October, but the Indian Ocean will still serve up waves-just bring your patience.
Average Spot conditions at Impossibles in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Impossibles 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 Impossibles for your next trip in December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Impossibles 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 Impossibles.