well our summers are somewhere in June, July, August and depending on the school term, runs into early September at some years..
but this is just cause of school terms and those who have families and children in school..
But as for work.. Businesses still remain open for work throughout the year, even during these months.. Most adults if they have children do take off time during the summer just cause their kids are out of school and go somewhere cool for the break.. but its not Mandated by the government or something.. you as an employee can take your vacation days anytime during the year.. some people tack on vacation days in Ramadan before and after Eid to spend some down time with family.. Some vacation during Hajj time.. Or they might take their vacations around spring break of their kids during the cooler months..
I do notice that loads of people leave during August just cause its so darned hot here..
My husband normally just takes 2 weeks off during summer, so we can go somewhere quick.. and his other 2 weeks of vacation, he takes here and there throughout the year when he feels like it..