Yes there is a difference, based on prior events Peter's Mountain seems to be huge factor on these type of events. Peter's Mountain seems to divide the county on the weather. You can go from the upper end of the county with 3 in of snow but once past the mountain Harrisburg could have nothing. So it happens with thunderstorms in the summer also but not all the time. I truly believe the mountain has some involvement in the weather dividing Dauphin County.