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 Winter weather charging into London region, causing dangerous ... (Dec 09, 2020) ... LONDON, ONT. Find historical weather by searching for a city, zip code, or airport code. Anywhere from 15 to 20 centimetres of snow is expected across Ontario ... london.ctvnews.ca Ontario has 4 seasons: summer, fall (autumn), winter and spring. In London, the summers are warm and partly cloudy and the winters are freezing, dry, windy, and mostly cloudy. With an average of 20.2 °C | 68.4 °F, July is the warmest month. The northern part of the province has longer and colder winters than southern Ontario. Include a date for which you would like to see weather history. 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. Weather history for places in Ontario. Usually January is the coldest month of the year, and July is the warmest. The weather depends on where you are because Ontario is a large province. Average Weather in London Canada. 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. [3] Much of England and Wales was snow-covered throughout the month. 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. was -63 °C in Snag, Yukon. Sign up for our email newsletter by entering your email address. 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