1999 was worst I’ve seen. Wheaton and Kemp Mill Glenmont and west 0.25+ and 27/28. Pepco had not trimmed yet and it was a 7 day out for some. We had to move relatives , Sharp demarcation as I was living in far a nw PG which is highest point and about 5 miles east and we definitely iced at 30/31 but only about 0.1 and not hard frozen.