Summer cool wind, winter snow.

夏有凉风，冬听雪。

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Cool summer dance sounds are drifting from the stereo indoors.

屋内立体声音响飘出美妙的夏季舞曲。

《柯林斯英汉双解大词典》

The rain washes away the signs of summer and brings in nice and cool air.

雨洗去了夏天旳痕迹，带来了清新而清爽的空气。

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You are up high, so even in the summer the air usually is cool.

VOA: special.2009.07.20

In one tragic case, six children at a summer camp drowned because camp counselors were following a Russian summer tradition of trying to cool off by drinking alcohol.

VOA: standard.2010.07.23

Electricity from Oregon and Washington is sent south in the summer to cool homes.

CNN: wind turbines

Cool climate varietals (like Pinot Noir, Chardonnay and Pinot Gris) thrive here thanks to our long summer days and cool nights, but we are slaves to whatever nature decides to throw us each year.

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As for temperatures, those who don't mind trading extreme winter cold for a relatively cool summer might like International Falls, Minn.

FORBES: Magazine Article