Question 1130050
temperature went down (-) 48 degrees (25-(-23)) in 8 minutes
that is -6 degrees per minute

One can also approach it as ending at - and starting at plus, so the drop was -23-25 or -48.

It went up and down 40 degrees in Spearfish, SD in 1943.   Sharply defined cold fronts can produce marked changes in temperature.  
I've experienced a 55 degree change in a day in the desert. :)