Charles - the answer you're looking for needs to come from a local agent. But, I want you to know that the upper end of EVERY market is in flux right now. I just finished writing a post analyzing market conditions in my area. If you're home is priced under $500K, there is less than a 6 month supply of homes. If you're home is over $1m, it's over a 35 month supply. THAT is a mega difference.
People who used to buy in the upper end of the market felt wealthy. They had retirement funds, good salaries, low taxes and investments. Now, their retirement funds are cut in half, their salaries may be adjusted or they could lose jobs soon because of changing economics, their fear taxes will increase (if salaries are $250K+) and the equity in their real estate and stock market investments have slipped. Unless you'll take an IOU, things aren't looking good for the the buyers of those upper end homes...
I don't know if the season matters as much as the economy.
Sorry. I just want you to hear it from me rather than an agent in your house that you might shoot when they say it.