Surfing in Hainan in December

Historical swell averages for December

Historical averages, 2022–2025 — not a forecast and not a surf-quality score.

Hours with rideable groundswell

2%

Median swell height

0.58 m

Median swell period

5.7 s

Derived from Open-Meteo marine reanalysis data (2022–2025), licensed CC BY 4.0. Swell availability, not surf quality — the season call is editorial.