Monroe is the largest city and county seat of Monroe County, Michigan, United States. The population was 20,462 as of the 2020 census. The city is bordered on the south by Monroe Charter Township, but the two are administered autonomously. Monroe is the core city in the Monroe metropolitan area, which is coterminous with Monroe County and had a population of 154,809 in 2020. Located on the western shores of Lake Erie approximately 20 miles northeast of Toledo, Ohio, and 40 miles southwest of Detroit, the city is part of the Detroit–Ann Arbor–Flint combined statistical area.
Monroe lies in the humid continental climate zone. It receives an average of 28.5 inches (72 cm) of snow a year — the lowest average snowfall for any large city in the state. July is the warmest month with an average high temperature of 84 °F (29 °C), and January is the coldest month with an average low temperature of 16 °F (−9 °C). Monroe does not normally have extremely hot or cold temperatures, as its climate is moderated by the lake. On average, the temperature only drops below 0 °F (−18 °C) a couple of times during the winter season, and it is even rarer for the temperature to rise above 100 °F (38 °C) during the summer. The coldest recorded temperature was −21 °F (−29 °C) on February 5, 1918. The highest recorded temperature was 106 °F (41 °C) on July 24, 1934, with another equal temperature recorded on one occasion many years earlier.