Guelph is a city in southern Ontario. It is called the Royal City. It has often been rated as one of Canada's best places to live. This is because it has a low unemployment rate and a low crime rate. In the 2011 census, Guelph had a population of 121,688. Guelph has warm, humid summers that can reach up to 30 °C (86 °F) and cold winters coming down to −25 °C (−13 °F). It is classified Dfb in the Köppen climate classification system.