what timezone is toronto gmt?
North American Eastern Time Zone
neutral
 Among its other uses , in 1880 , measurements from the site were used as part of the effort to develop standard time . The observatory remained the official timekeeper for Canada until 1905 , when that responsibility was transferred to Ottawa 's Dominion Observatory . At exactly 11 : 55 am the clocks in Toronto fire halls were rung by an electrical signal from the Observatory . 

neutral
 As of 1943 , Toronto was divided into 14 zones , numbered from 1 to 15 , except that 7 and 11 were unused , and there was a 2B zone . 

neutral
 = = = = Invested in and operates ( owned by the City of Toronto ) = = = = 

contradiction
 Spring and fall are pleasantly mild but prone to drastic temperature changes ; spring even more so than fall . Late season heat waves as well as " Indian summers " are possible . Early and late season snow storms can occur in November and March , and more rarely in April . Montreal is generally snow free from April 15 to November 15 . 

neutral
 The Toronto Magnetic and Meteorological Observatory is a historical observatory located on the grounds of the University of Toronto , in Toronto , Ontario , Canada . The original building was constructed in 1840 as part of a worldwide research project run by Edward Sabine to determine the cause of fluctuations in magnetic declination . Measurements from the Toronto site demonstrated that sunspots were responsible for this effect on Earth 's magnetic field . When this project concluded in 1853 , the observatory was greatly expanded by the Canadian government and served as the country 's primary meteorological station and official timekeeper for over fifty years . The observatory is considered the birthplace of Canadian astronomy . 
