.The Summer Triangle is a stellar treat for northern mid-latitudes summer sky watchers. It graces the sky all night long in summer, and its three bright stars are visible even in urban areas. Under dark skies you can also see the Milky Way within the asterism. I'll also add that although it's been named the
summer triangle, you can actually see it in northern mid-latitudes throughout the year. However it's visible all night long during the summer months.
Summer Triangle