...RECORD RAINFALL FOR SUMMER 2010 IN SIOUX FALLS SD... RAINFALL THROUGH 10 AM CDT MONDAY AUGUST 2ND AT JOE FOSS FIELD IN SIOUX FALLS SOUTH DAKOTA HAS TOTALED 1.55 INCHES. THIS BRINGS THE TOTAL RAINFALL SINCE JUNE 1 TO 17.93 INCHES. FOR THE SUMMER MONTHS OF JUNE THROUGH AUGUST THIS IS THE WETTEST ON RECORD. THE PREVIOUS WETTEST SUMMER OCCURRED IN 1993 WHEN A TOTAL OF 17.39 INCHES FELL. WITH NEARLY A WHOLE MONTH LEFT...WE WILL LIKELY BE ADDING ON TO THIS TOTAL.