Every owner, occupant, lessee or agent of any property abutting on any paved sidewalk shall remove or cause to be removed from such paved sidewalk all hail, snow or sleet falling thereon within one hour after such hail, snow or sleet has ceased falling; provided, that in case of a storm between the hours of five p.m. and six a.m. such sidewalk shall be cleaned before eight a.m. following such storm. (Prior code § 21-12)