After today's rainfall of 1.20", only 0.22" would fall for the rest of the month (and none from 9/10 thru the first week of October) - but September's rainfall would be more than what fell for the entirety of August (1.07"). Today's rain was associated with what was left of the season's first tropical storm.
The year's biggest rainstorm dumped 3.84", mostly between 11 AM-9 PM. After this storm, the next 30 days would see just 0.43" of rain (followed by an 18-day period between 10/3-20 with nine inches). Today's rainfall was a record for the date (later broken in 2021 by more than three inches).
With winds out of the northeast, it was a cool Labor Day, with a high/low of just 69°/55°, ten degrees below average. This was the coolest Labor Day in the 1970-2022 period (based on mean temperature). The one saving grace was that skies were sunny.
After a stifling morning low of 76°, the high topped out at 95°, making this the hottest Labor Day since 1973, when the high reached 96°.
Although "meteorological summer" (June 1 - Aug. 31) ended yesterday, Mother Nature paid no mind as the mercury soared to a steamy 95°.
For the second year in a row the temperature never got out of the 60s on Labor Day. And like the previous year, rain fell, but not nearly as much as in 2002 (0.59", compared to last year's 1.63").
September began just as August ended, with a high 96° after a low of 76°.
Today was the Saturday of Labor Day weekend, and the high of 90° was the first 90-degree reading to occur during the holiday weekend since 1998. This was also the nineteenth, and last, 90-degree reading of the year (the average number is eighteen).
It was a very sultry Labor Day, and the high/low of 88°/75° (nine degrees above average) made it the warmest Labor Day since 1983 (based on mean temperature), when it was 91°/73°.
This morning's low of 55° was the first reading below 60° since 6/9, and was the chilliest reading on this date since 1975. And with a high of 71°, the day's mean temperature of 63° was the coolest on 9/1 since 2002, when the high/low was 65°/59° (a mean of 62°).
Although Hurricane Ida, which made landfall in Louisiana four days earlier as category 4 storm, had weakened to a tropical depression by the time it made its way to the Mid-Atlantic, the energy that remained packed quite a punch after merging with a cold front as New York was flooded by extreme rainfall and lashed by tropical storm-force winds (causing greater disruptions than tropical storm Henri did less than two weeks ago). After a first round of moisture brought light showers shortly after sunrise, there was a lull until 5 PM when heavy rain moved in, becoming torrential a few hours later. By midnight, 7.13" had been measured in Central Park – comparable to seven weeks worth of rain, and two-and-a-half inches more than a typical September sees in its entirety.
At its most intense, between 9-10 PM, more than three inches poured down. Because of this excessive rate of rainfall, the National Weather Service, for the first time, issued a Flash Flood Emergency for NYC, and subway service was suspended throughout the City. Shockingly, the City suffered 13 flood-related fatalities. Unlike Henri, which wasn’t a wind producer, Ida’s visit was accompanied by winds that gusted between 35-50 mph.
Between Aug. 21 (when Henri moved in) and today, 15.99" of rain was measured in Central Park. And between June 30 and today, 29.19" fell - which is 20 inches more than the amount that typically falls during this nine-week period.
In a complete reversal from last year, skies were clear and the humidity in mid-afternoon dropped to 22%, which was just the fourth time this century that the humidity level in September was at or below 25%. It was also a warm day, with a high of 86°, which was warmer than the warmest reading of the past two Septembers (both at 85°).