The Cote des Basques in France offers its best surf conditions during the winter and early spring months, particularly from October through March. During this period, ground swell dominates with percentages ranging from 66% in October up to 88% in January, ensuring consistent, high-quality waves. The mean swell size is also most favorable, averaging between 1.4m in October and peaking at 2.0m in January. Wind conditions improve slightly toward late autumn and early winter, with October standing out as having the highest likelihood of good winds (41%), though even the best months still see challenging wind conditions more often than not. Late spring through summer (May to August) sees a significant drop in ground swell activity and smaller wave sizes (1.0-1.3m), with wind swell becoming more prevalent. Wind conditions are least favorable in these months, with June and July having only 24% good wind days, making surfing more inconsistent. September marks the transition back into better conditions, with ground swell increasing again and wind reliability improving slightly. For advanced surfers seeking powerful, clean waves, the window from November to February is prime, despite the higher chance of strong onshore winds. Those looking for slightly milder but still solid conditions may prefer October or March as alternatives. The summer months are best suited for beginners or longboarders due to smaller, wind-driven swells and generally poorer wind alignment.