Winter weather charging into London region, causing dangerous ... (Dec 09, 2020) ... LONDON, ONT. The coldest temperature ever to be officially recorded in Canada. Ontario has 4 seasons: summer, fall (autumn), winter and spring. The northern part of the province has longer and colder winters than southern Ontario. Find historical weather by searching for a city, zip code, or airport code. The City of London is marking the coldest month on record this February, beating the last low by a whole degree. was -63 °C in Snag, Yukon. Ontario Interactive Map of Historical Record High and Low Temperatures Usually January is the coldest month of the year, and July is the warmest. At -6.1 °C | 21.0 °F on average, January is the coldest month of the year. January 1963[edit] January 1963 was the coldest month of the 20th century, and the coldest since January 1814, with an average temperature of −2.1°C. The weather depends on where you are because Ontario is a large province. Sign up for our email newsletter by entering your email address. In London, the summers are warm and partly cloudy and the winters are freezing, dry, windy, and mostly cloudy. Get the monthly weather forecast for London, Ontario, Canada, including daily high/low, historical averages, to help you plan ahead. Average Weather in London Canada. London Weather by month // weather … With an average of 20.2 °C | 68.4 °F, July is the warmest month. -- A snowfall warning is in effect for Southern Ontario. Here is a look at some of the coldest temperatures recorded provinically and in all 50 U.S. states. Include a date for which you would like to see weather history. Extreme temperatures for Canada's largest cities - continued: High °C Date City Low °C Date; 37.6: Aug 1, 1975: Montreal-37.8: Jan 15, 1957: 36.5: July 8, 1988 Weather history for places in Ontario. Over the course of the year, the temperature typically varies from 16°F to 79°F and is rarely below -0°F or above 87°F.. 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