Summer begins in June.

夏天从六月开始。

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Summer begins on the longest day of the year.

夏天开始于一年中最长的一天。

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Summer begins in June and lasts three months.

夏天从六月份开始，持续三个月。

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As summer begins, they are trying, with spotty success, to be parents to their 4-year-old daughter, Ruthie, while they struggle with intractable grief that's been tearing their marriage apart.

WSJ: 'Door in the Floor' Hinges on Performances

And, finally, the summer begins on Memorial Day, a US public holiday which falls on the last Monday in May (after which it is socially acceptable to wear white), and ends on Labor Day, the first Monday in September.

BBC: Escape from New York

Two weeks before summer officially begins and with nothing but shingles atop 1600 Pennsylvania Ave.

FORBES: Advocates Remind Obama of His Solar Pledge as the Clock Ticks