Etesian

. The etesians (/ᵻˈtiːʒənz/ or /ᵻˈtiːziənz/; Ancient Greek: ἐτησίαι etēsiai "periodic winds"; sometimes found in the Latin form etesiae), meltemia (Greek: μελτέμια; pl. of μελτέμι meltemi), or meltem (Turkish) are the strong, dry north winds of the Aegean Sea, which blow from about mid-May to mid-September. The Etesian winds are a dominant weather influence in the Aegean Basin.

They are at their strongest in the afternoon and often die down at night, but sometimes meltemi winds last for days without a break. Similar winds blow in the Adriatic and Ionian regions. Meltemi winds are dangerous to sailors because they come up in clear weather without warning and can blow at 7–8 Beaufort. Some yachts and most inter-island ferries cannot sail under such conditions. However, they often provide a good, steady sailing wind favored by leisure sailors.

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Wikipedia