This morning's (and Sept. 19th's) low of 56° was the coolest reading of the month. (The coolest reading in September is typically in the upper 40s.) August had a cooler reading than September (55°). Not surprisingly, this was, at the time, the third warmest September on record (now ranked eighth).
It was a day with very chilly conditions, with a high/low of only 53°/43°. Today's high, 20 degrees below average, was more typical of the second week of November. Unseasonably chilly days like this in autumn are often caused by nor'easters, but this particular day was dry under a mix of sun and clouds.
With a high of 89°, this was the third day in a row of summertime heat. Yesterday's high was 90°, and the day before that was 89°. The average high this time of year is in the low 70s. Today's high was a record (which stood until 2017).
This morning's low of 43° (14 degrees below average) was the earliest date for a temperature this chilly since 1963, when a low of 40° was posted on this date - the record for the date.
For the third day in a row the high temperature reached 70°.
Today's high was 71°, the first time this month the temperature failed to reach 80° or higher - a record streak for September. Up until today, the month had been seven degrees warmer than average.
Today's morning low of 67° was the mildest low temperature of the month (it also occurred on Sept. 9 and 19). This was the coolest "maximum" low temperature for any September since 1967 (when it was also 67°).
Under clear skies, the morning low fell to 47°, eleven degrees below average and the chilliest reading in September since 2000, when a low of 43° occurred on Sept 29.
The high reached 71° for the third day in a row, close to the seasonal average.
Under clear skies the temperature reached 91°, the first 90-degree reading since 8/1, and the latest date for a 90-degree high since 1970, when there were highs in the 90s on 9/25 and 9/26 (however, in 2019 there would be a high of 93° on 10/2). This was a record for the date, and the first time the temperature rose into the 90s on 9/24. Today was also the twelfth day in a row with above average temperatures.