SXUS73 KDMX 201216 RERDMX RECORD EVENT REPORT NATIONAL WEATHER SERVICE DES MOINES IA 715 AM CDT THU APR 20 2018 ...RECORD DAILY LOW TEMPERATURE SET AT MASON CITY... A RECORD LOW TEMPERATURE OF 17 DEGREES WAS SET AT MASON CITY THIS MORNING. THIS BREAKS THE OLD RECORD OF 21 SET IN 1928. $$ CURTIS