so we start with -13 degrees. from 5-6 the temp went down 3 degrees, so now it's -16 degrees. then it goes down 2 degrees, so now it's at -18 degrees. then it goes down 6 degrees, so now it's at -24 degrees. from 8-9 it goes up 7 degrees, so at 9 am the temperature is -17 degrees.