Refer to figure.
Temperate transitional climate (35°-40°N/S) formerly known as the warm temperate climate or Mediterranean climate.

Winter
Frontal and thermal depressions prevail: cloudy, windy and cool weather with frequent precipitations.

Summer
As the Thermal Equator moves slightly towards the pole, the anticyclonic dry subtropical climate prevails: warm and dry air, clear skies, land and sea breezes on the coasts.

Upper winds are westerly winds and the annual rainfall is below 700 mm.

Why the other options are incorrect:

• “In winter it is influenced only by the subtropical high-pressure belt.” → INCORRECT. During winter, the subtropical high-pressure belt shifts southward, allowing the westerlies and mid-latitude depressions to influence the Mediterranean, bringing unsettled weather and rainfall.
• “Hot summers alternate with cold winters.” → INCORRECT. The Mediterranean climate is characterized by warm or hot, dry summers and cool or mild, wet winters. In climatology, "cool" does not mean "cold." While some inland or mountainous Mediterranean areas may experience cold winters, this is not a defining characteristic of the Mediterranean climate.
• “It is not influenced by the westerlies.” → INCORRECT. The Mediterranean is strongly influenced by the westerlies during winter, which bring frontal systems responsible for most of the region's annual precipitation.