Winter weather charging into London region, causing dangerous ... (Dec 09, 2020) ... LONDON, ONT. London average temperature. Weather history for places in Ontario. The northern part of the province has longer and colder winters than southern 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.. Based on the tourism score, the best time of year to visit London for warm-weather activities is from mid June to early September. At -6.1 °C | 21.0 °F on average, January is the coldest month of the year. Include a date for which you would like to see weather history. The City of London is marking the coldest month on record this February, beating the last low by a whole degree. The weather depends on where you are because Ontario is a large province. Usually January is the coldest month of the year, and July is the warmest. Ontario Interactive Map of Historical Record High and Low Temperatures In London, the summers are warm and partly cloudy and the winters are freezing, dry, windy, and mostly cloudy. Find historical weather by searching for a city, zip code, or airport code. Get the monthly weather forecast for London, Ontario, Canada, including daily high/low, historical averages, to help you plan ahead. 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 was -63 °C in Snag, Yukon. -- A snowfall warning is in effect for Southern Ontario. Ontario has 4 seasons: summer, fall (autumn), winter and spring. Average Weather in London Canada. Here is a look at some of the coldest temperatures recorded provinically and in all 50 U.S. states. With an average of 20.2 °C | 68.4 °F, July is the warmest month. The coldest temperature ever to be officially recorded in Canada. 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