Zavial, Portugal, is a reliable surf spot with consistent swells year-round, though the best conditions are concentrated in the winter months. From November through March, the spot benefits from strong ground swells, with December and January offering the largest waves, averaging 2.0m and 1.9m respectively. These months also have the highest percentage of ground swell (81-89%), ensuring clean, powerful waves. However, wind conditions are less favorable during this period, with good winds occurring only 29-34% of the time, meaning cross-shore or onshore winds are frequent. February and March maintain solid swell size (1.7-1.9m) but share similarly challenging wind patterns. From April onwards, ground swells diminish, and wind swells become more dominant, particularly from June to August, when ground swells drop below 30%. Summer months (June-August) see the smallest waves (1.0-1.1m) and the highest wind swell influence. While wind conditions improve slightly (32-36% good winds), the wave quality is generally lower due to the mixed swell direction and smaller size. September and October mark a transition back to better conditions, with ground swells increasing again (46-63%) and wave height rising to 1.5m by October. Wind conditions also improve, with 36-38% favorable winds, making early autumn a decent alternative for surfers who prefer milder swells. Overall, the prime time for surfers seeking powerful, clean waves is winter (December-February), despite less reliable winds. Those willing to compromise on size for more manageable conditions may prefer September-October. Summer remains the least consistent period for quality surf.