Brighton and Hove City Council said roads had been gritted on Friday, Saturday and Sunday, and between 11pm and 3am overnight.
It said temperatures had dropped too far for the salt to have an effect.
A spokesman told The Argus people can use table salt to grit their drives and paths, or use the 300 grit bins around the city.
People are being asked to visit vulnerable or elderly neighbours to check they are all right.
The council was planning to begin ploughing snow from the roads this morning.
The Argus is building your comprehensive up-to-date guide on the snow chaos sweeping the county.
If a road is closed or you spot a crash, we want to hear about it.
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