After reaching a record 65° shortly after 10 AM, the temperature dropped like a rock, and by midnight the mercury had fallen to 26°.
The first measurable snowfall of the winter produced two inches of accumulation. The next measurable snowfall wouldn't be until 1/13, and the next snowfall of an inch or more wouldn't be until 2/20.
Today, and three of the previous four days, all had a high of 55°, ten degrees above average. And the one day without this high, 12/6, had a high of 57°.
On the night John Lennon was shot outside his apartment building in Manhattan's Upper West Side, temperatures were very mild. The day's high of 64° occurred after dark. This reading, eighteen degrees above average, was the mildest of the month.
Over the past nine days, the high/low temperatures averaged 60°/50°, sixteen degrees milder than average.
The first snowfall of the season fell late this morning, but it was just a dusting of 0.1". The day was cold and raw, with a high/low of 31°/28°.
During a month that would be very mild (6.3 degrees above average), today was an anomaly as it was 15 degrees colder than the average, with a high of 29°/low of 18°. These teeth-chattering temperatures came just one week after a record high of 70°. This was also the earliest date for a low below 20° since the brutally cold December of 1989.
It was a gray and raw day with a high/low of 33°/29°. The first measurable snow fell late in the afternoon, amounting to 0.7". Although areas in central and south Jersey, southeastern PA, DE, MD and northern Virginia saw significant accumulations (generally 3-6"), the moisture hit a wall of cold/dry air as it approached the New York City metro.
Today's low of 24° was the coldest reading in December - but two degrees "warmer" than November's coldest reading (on 11/19). Since 1970 only two other Decembers had a milder reading than November for its coldest temperature.
Although today's high/low of 49°/41° was five degrees above average, it was the chilliest day of the first half of December.