A Frost Advisory continues for Butler County and surrounding areas until 9 a.m. Tuesday.
Forecasters at the National Weather Service said temperatures are cold enough for the development of frost.
Sensitive plants may be killed or damaged if left uncovered or outside.
The most widespread and prolonged damaging frost will occur in the sheltered deeper valleys through the Laurel Highlands.
Expect sunny skies today with temperatures reaching a high near 63.
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