The hottest day in New York City history was on July 9, 1936, where it reached a staggering 106 degrees. Pair that with the accepted fashion of the time — i.e. shorts and tanktops were barely in vogue on Coney Island, much less casual dress wear through the streets — and you’ve officially got one of the most unpleasant days in the city’s history of recorded temperatures.
At 104 scorching degrees, runner up goes to July 21, 1977 — which actually occurred eight days AFTER the legendary blackout — and August 17, 1918, seeing the end of World War I and the beginning of a devastating influenza epidemic.
And the coolest NY July day? July 1, 1943 experienced a record low of 52 degrees. Jacket weather!