CASTLE HILL - Side streets in Castle Hill were blanketed with snow Friday.

Mayor Bill de Blasio says 100 percent of the city's primary roads have been plowed and more than 90 percent of secondary roads are clear.

Residents must clear the snow and ice from sidewalks within four hours after the snowfall has stopped.

If the snow becomes frozen and too hard to remove, unused cat litter, salt, sand or sawdust can be spread to help with the cleanup.

Authorities also ask that residents not throw snow into the street and not cover fire hydrants.