27.7 and ZR, but this is really low-impact due to the sun angle. Little accumulation on the wires or trees. Sidewalk is wet. Metal surfaces are certainly icy.
The HRRR and 3k NAM seem to agree that it is mostly freezing drizzle during the day Saturday and then there is a batch of ZR that moves through overnight.
DCA might have had a sub freezing day except for the midnight high.