It is seen in this map that Brampton is one of the highest areas on the map with a surface temperature close to around 34 - 45C (light orange to dark orange). However, in the top left corner which would be Caledon is shown more a frog green to turquoise-green colour having a surface temperature of around 31-27C. 

The main reasoning due to the drastic temperature difference is simply due to Caledon being a more rural area with more farms and Greenland, yet, Brampton is quite the opposite and is slowly turning into quite a developed city with more buildings and houses which may be good for the people but not for the environment.