CARIBOU, Maine — The National Weather Service has issued a freeze warning for northern Maine, while a frost advisory is in effect for most of the rest of the state.
The weather service said an unseasonably cold air mass combined with clear skies and calm winds will result in widespread frost from 2 a.m. to 6 a.m. Tuesday in northern areas, where temperatures are expected to fall below freezing.
Most other regions, including southern and coastal areas, are under a frost advisory in the overnight hours. Temperatures are projected to drop into the lower to mid-30s, but a hard freeze is not anticipated.
The weather service says potted plants that are normally left outdoors should be covered or brought inside away from the cold.