Seasons on the "island of eternal spring"?
Without being particularly heroically, one can bathe on Fuerteventura throughout the year in the sea. The water and air temperatures in the spring however are lowest and in the autumn highest.
The climate is coined by the trade wind and the compensatory sea. In the winter the trade wind system as well as the sun can shift so far to the south that low pressure areas from the north bring rains. In the summer the trade wind blows so strongly that sand is whirled up by the dry hot air and the sea foam of the surf at the leeward beach is floated seaward