Brutally cold weather is expected to hit much of the country later in the week.
He said the number of fatalities was likely to increase.
Most of the dead in Kentucky, Beshear said in an earlier news conference, drowned when trapped in their vehicles by fast-rising floodwaters. The victims included a mother and her child.
Beshear said more than 1,000 people had been rescued by first responders within 24 hours.
More than 500,000 customers were without power Sunday from the South through New York state, according to monitoring website poweroutage.us.
The National Weather Service predicted the center of the country would be hit this week by a mass of extremely cold Arctic air, bringing record temperatures that could hit brutal lows -- even -60 degrees Fahrenheit (-51 degrees celsius) in the Plains states near the Canadian border.
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