Snow will develop on Monday during the early afternoon hours across the Metropolitan Area. Snow will quickly change over to either Sleet or Freezing Rain continuing through much of the evening hours. Temperature profiles will be tricky, however I suspect that with the rather cold, dry air mass in place, once precipitation begins falling, temperatures will fall to at or below freezing for most locations along and west of the interstate 95 corridor causing treacherous travel on untreated roadways.
Periods of freezing rain are expected to continue through much of the evening and overnight hours on Monday causing hefty ice accumulations of over a quarter-inch well north and west of the Capital Beltway. Even in DC (away from the Potomac and National Airport) I would expect a glaze of a tenth to as much as two-tenths of an inch of ice on elevated surfaces, trees and power lines.
Temperatures in the northern neck of Virginia and southern Maryland will likely see temperatures creep into the middle to upper 30s Monday night allowing for predominantly a cold rain event, however even here, a glaze of ice is possible before the change over. All in all, the commute on Monday afternoon is looking tricky, especially given the very cold antecedent conditions and the dry air that is locked in place.