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That fits very well with the solar driven cooling theories. Solar cycle 23 was significantly weaker then solar cycles 21 and 22. Without the atmospheric heating caused by the 1998 El Nino, we would probably have a solid cooling trend since the early 1990's.

So the US winters have been cooling. We all have witnessed the affects from that cooling the past 3 winters and this will be cold winter #4 in a row. Now the summer has seen some recent warming in the US southeast, but summers in the northwest have continued cooling along with winters in that area. My guess is that the warmer summer temps in the southeast are caused by the cooling mountains out west. Those cold mountains block the heat coming up from Mexico during the summer. That heat is then forced into Texas and then to the east. So during an Ice Age, Texas and the southeast will be the place to be. Which of course should be obvious.