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 London average temperature. -- A snowfall warning is in effect for Southern Ontario. [3] Much of England and Wales was snow-covered throughout the month. The northern part of the province has longer and colder winters than southern Ontario. Winter weather charging into London region, causing dangerous ... (Dec 09, 2020) ... LONDON, ONT. Anywhere from 15 to 20 centimetres of snow is expected across Ontario ... london.ctvnews.ca Usually January is the coldest month of the year, and July is the warmest. Ontario has 4 seasons: summer, fall (autumn), winter and spring. Here is a look at some of the coldest temperatures recorded provinically and in all 50 U.S. states. Ontario Interactive Map of Historical Record High and Low Temperatures Find historical weather by searching for a city, zip code, or airport code. 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. 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.. Based on the tourism score, the best time of year to visit London for warm-weather activities is from mid June to early September. Sign up for our email newsletter by entering your email address. Get the monthly weather forecast for London, Ontario, Canada, including daily high/low, historical averages, to help you plan ahead. London Weather by month // weather … At -6.1 °C | 21.0 °F on average, January is the coldest month of the year. The coldest temperature ever to be officially recorded in Canada. Weather history for places in Ontario. The City of London is marking the coldest month on record this February, beating the last low by a whole degree. 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