Besides the probable DIFFERENT sales mix?
IMO Mississauga (and West in general) traditionally was higher priced and has higher demand than East. Even within Toronto Etobicoke trumps the Scarborough.
As well making "analysis" over 1 month for market where people buy for YEARS it's a bit of profanation. You could derive some tendency over monitoring same kind of properties in some specific hood on such short time horizon, but compare monthly average to average is as good as tossing a coin