Temperatures are expected to drop into the 30s and 40s overnight Thursday in the D.C. region. That’s chilly enough to kill some delicate outdoor plants.

Friday is expected to start out cold before unseasonably warm temperatures arrive in the afternoon.

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“Mainly clear and chilly overnight, the coldest temperatures north and west of D.C.,” 7News First Alert Meteorologist Steve Rudin said, adding that temperatures will stay above 40 in the District.

There are frost advisories planned for areas west of D.C., beginning in the predawn hours Friday and lasting through 9 a.m.

During a frost advisory, the

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