How do you say Is It at summer or in summer ? in English (US)?

quot;in summer". "on" is used for dates (e.g. "on Monday", "on Christmas day", "on September 10th") "at" is used for times (e.g. "at 5:00 PM", "at midnight", "at noon") "in" is used for weeks, months, years, and seasons (e.g. "I want to visit Canada in the winter", "I plan on going skiing in December", "I went to Spain in 2012")|in summer is correct but it is more common to hear "in the summer" or "in the summertime"|in summer
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