West Yellowstone Montana (1983)
Minus 6 degrees (F) (Record for month is minus 9 degrees in continental U.S. This was also recorded at West Yellowstone).
Charleston, SC (1989)
Hurricane Hugo intensified throughout the day as it moved northwestward toward Charleston. Hugo made landfall just before midnight (Sept. 22) over Sullivans Island, north of Charleston, with winds estimated between 130 and 150 mph northeast of the eye. Central pressure at the time of landfall was 934 MB or 27.58 inches. Winds gusted from 100-119 mph in downtown Charleston. The storm surge northeast of Charleston reached 20 feet, destroying most beach homes on the Barrier Islands.
Casper, WY (1994)
Temperature drops from 78 to 33 in 24 hours. 3" of snow accompanied the temperature plunge.