Calvià has a mild Mediterranean climate with an average annual temperature of 19 °C and an average annual rainfall of 410 mm. It is influenced by two types of atmospheric circulation manifested in two distinct seasons: a hot, dry summer with little pressure gradient and occasional rainfall, as opposed to a cool, wet winter. The coldest month is January, with 15.1 / 3.5 °C and the hottest is August, with 31.0 / 18.2 °C. Rainfall averages 51 days a year and there are approximately 2,756 hours of sunshine. The average temperature in the summer is 27 °C, and 14 °C in winter. The driest month is July, at an average of 7.8 l / m2, while the wettest is December with an average of 81.1 l / m2. The area is sheltered from the Nordic Tramuntana wind by mountains that are over a thousand feet high. The thermal variation of the water has a range of around 15 °C. During the winter, it drops down to about 13 °C. In the late spring, warming occurs, raising the temperature one degree each week. During the summer, a 25 cm deep water layer reaches temperatures above 25 °C.(something of a thermocline).