Get ready for a slippery commute. Monday’s light dusting of snow turned into freezing rain by evening, making for icy conditions on roads and sidewalks into Tuesday morning, the National Weather Service said.

“The city has its public works crews out since early Monday, salting the roads and doing their best to keep the roads as safe as possible,” said John M. Guilfoil, a spokesman for Mayor Thomas M. Menino. “As always with winter weather, we urge commuters to use public transportation as much as possible.”