Monday night was the coldest night in nearly two years.
According to the National Weather Service, the overnight low in Lexington, recorded just before 4 a.m. Tuesday, was 10 degrees.
It hasn't been that cold in the region, according to the weather service, since Feb. 10, 2011, when the temperature bottomed out at 3 degrees.
Tuesday night isn't likely to be any colder — or much warmer. The weather service forecasts a low of 11 degrees.
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The cause of this freeze is arctic air sliding in from the north.
Tuesday is expected to be sunny and cold with a high near 20. The chill is expected to ease on Wednesday, with a projected high of 30 degrees and a low of 21.
By late in the week, sleet or a wintry mix of precipitation is expected, with Northern Kentucky likely to get snow on Thursday night.