This one has been quite the opposite (so far).
|This chart shows day and nighttime|
temperatures across the East Coast
Nights should regularly
be in the 50s by now
A meteorologist explained to me that winter Jet Stream is usually a full wavelength across the United States. By that he meant when the Jet Stream is making a valley out West (i.e. thus bringing in cold air from the north), it's making a hill (i.e. thus allowing tropical air to invade) in the East.
That being said, even he seemed perplexed.
Always good to have a working theory in the mix.