From the National Weather Service:
Mixed precipitation changes back to snow tonight, with additional 1" snowfall & 0.1" ice accretion south of MA Route 2. Slow down if driving this evening! Drying out in time for Wed AM commute. Mainly dry on Wed but have to watch for the potential for isolated snow squalls with the passage of an Arctic front in the afternoon, which may cause temporarily reduced visibility for the early evening commute. Then bitter cold Wed night into Thu AM with wind chills -5 to -15°F for school bus stops.
See additional briefing graphics below.