Microclimates exist all around us. It may be that side of a city that always seems to be a little warmer, or always gets more snow. Think about Calgary, with its rain shadow from the mountains and chinook winds, or downtown Vancouver, which generally is warmer and sees less snow than surrounding areas. Microclimates can range in scale from the urban heat island effect that encompasses an entire downtown, right down to the sides of your yard that are able to grow different things.