SXUS73 KFSD 190141 RERSUX RECORD EVENT REPORT NATIONAL WEATHER SERVICE SIOUX FALLS SD 0741 PM CST SUN DEC 18 2016 ...RECORD LOW TEMPERATURE SET AT SIOUX CITY IA... A RECORD LOW TEMPERATURE OF -20 DEGREES WAS SET AT SIOUX CITY IA TODAY...DECEMBER 18 2016. THIS BREAKS THE OLD RECORD OF -19 SET IN 1983. $$