July 21 is the date most likely to see a high in the triple-digits in New York. Since 1870 the mercury has hit 100+ six times on this date: in 1926, 1930, 1957, 1977, 1980 and 1991.
Today's high of 104 degrees was a record for the date and the third day of the last four to have a high in the triple digits. Today was also the final day of a nine-day heat wave that saw afternoon highs average 97 degrees (eleven degrees above average). This heat wave is associated with the infamous 1977 blackout, which occurred on the evening of the heat wave's first day.
A second day in a row of triple-digit heat. Today's high of 102/low of 82 made this the hottest day of the year.
Diana Ross' free evening concert in Central Park was interrupted and ultimately postponed when severe thunderstorms lashed the area between 5:30-9PM (2.26" of rain fell, two-thirds of the month's total precipitation). It was also a hot day as the high reached 95, the ninth day of 90-degree weather in the past ten days. (To read more about this infamous concert click here.)
In the past five days more than five inches of rain fell during tropical downpours. Today 1.65" poured down between 6PM-midnight. This was also the eighteenth day in a row with above-average temperatures. Sixteen of the days had highs of 88 or hotter.
An evening thunderstorm produced 1.11" of rain in just 45 minutes (5:06-5:51 PM).
Today's high of 102 made this the hottest day of the summer. The last time it was this hot in NYC was on this date in 1980. Some relief arrived when a thunderstorm dropped 0.46" of rain between 5-6PM.
0.81" of rain fell in a 45-minute period between 11:05-11:50 PM.
1.95" of rain fell mostly during two storms, one from 8-9AM when 0.84" fell and the other between 3-4PM when 0.70" was measured. During the morning deluge 0.69" fell in a 10-minute period.
This was the last day of a six-day heat wave, which accounted for half of the summer's 90-degree days. High temperatures during these days ranged between 92 and 96.
This was the fourth morning in a row with a low of 75 degrees, five-and-a-half degrees warmer than average. (New York's average a.m. low is 70 degrees for only three days, between July 20-22).