office. 20th century Sandwich, Ford City and Walkerville were separate legal entities (towns) until 1935. They are now historic neighbourhoods of Windsor. Ford City was incorporated as a village in 1912; it became a town in 1915, and a city in 1929. Walkerville was incorporated as a town in 1890. Sandwich was established in 1817 as a town with no municipal status. It was incorporated as a town in 1858 (the same year as neighbouring Windsor). Windsor annexed these three towns in 1935. The nearby villages of Ojibway and Riverside were incorporated in 1913 and 1921, respectively. Both were annexed by Windsor in 1966. During the 1920s, alcohol prohibition was enforced in Michigan while alcohol was legal in Ontario. Rum-running in Windsor was a common practice during that time. On October 25, 1960, a massive gas explosion destroyed the building housing the Metropolitan Store on Ouellette Avenue. Ten people were killed and at least one hundred injured. The Windsor Star commemorated the 45th anniversary of the event on October 25, 2005. It was featured on History Television's Disasters of the Century. Climate Windsor has a humid continental climate (Köppen climate classification Dfa) with four distinct seasons. Among cities in Ontario, Windsor has the warmest climate. The mean annual temperature is , among the warmest in Canada primarily due to its hot summers. Some locations in coastal and lower mainland British Columbia have a slightly higher mean annual temperature due to milder winter conditions there. The coldest month is January and the warmest month is July. The coldest temperature ever recorded in Windsor was on January 29, 1873, and the warmest was on June 25, 1988. Summers are hot and humid, with a July mean temperature of (the highest such mean in Canada, with the warmest summer nights in the country) although the humidex (combined feel of temperature and humidity) reaches 30 or higher on 70 days in an average summer; the highest recorded humidex in Ontario, 52.1, occurred on June 20, 1953. Temperatures remain warm during summer nights due to the high humidity. Windsor has some of the warmest summer night time temperatures in Canada. Thunderstorms are common during summer and occur on average 32 days per year, some of them severe with high winds, heavy rainfall, flooding, intense lightning, hail and less often, tornadic activity Winters are generally cold with a January mean temperature of . Windsor is not