It is hot in NYC this summer and while boozy summer cocktails still have their place, for my money, the official drink of this summer is Beer+Lemonade, variants of which are called a Shandy and Radler. Not only is it delicious, but it is refreshing.
The lower alcohol content doesn't overwhelm and the citrus-y flavors just hit the spot in the evening or the daytime, and will help on the preventing hangovers front. This might not be a party drink, but it is definitely a summer drink.
According to the linked Wikipedia article, Radlers trace back in Germany to a gastronomer in Munich by the name of Franz Xaver Kugler, who is credited with their invention in 1922. But it also notes that references to Radler predate Franz by ten years, so he may have been just the best PR person at the time. Here's how I make my Beerade: