Overnight freezing and daytime temperatures in the mid-30s will at times make for slippery roadways and potentially treacherous driving conditions, starting Monday and continuing through the week.

The National Weather Service put out an advisory at 7:09 p.m. Monday warning that as temperatures fall, “melted snow will refreeze. This will result in areas of black ice across the region . . . most likely on untreated or elevated surfaces.”

It added: “Motorists should be on the lookout for rapidly changing road conditions tonight.”

On Monday, as Long Island continued to dig out from a massive weekend storm, temperatures in the mid-30s were likely, with winds from the northwest shifting to the southwest at 5 to 15 mph.

Conditions turned icy after sundown, clouds are increasing, and overnight lows will be in the mid-20s, the service said.

The nor’easter Saturday and into Sunday dumped more than 2 feet of snow in some areas of Long Island, the service said.

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In Nassau, the final counts were 29.6 inches in Hicksville and 28 inches in Baldwin.

In Suffolk, Islip and Bay Shore shared the top spot, each with 26 inches of snow.