Weather.com brings you the most accurate monthly weather forecast for London, Ontario with average/record and high/low temperatures, precipitation and more. The tables list the maximum and minimum yearly temperatures, in degrees Celsius and Fahrenheit, based on weather data collected from 1981 to 2010. London Weather by month // weather averages The Winter of Discontent London on the rocks by JustB! via the Londonist Flickrpool. There is more rainfall in the winter than in the summer in Ontario. With an average of 20.2 °C | 68.4 °F, July is the warmest month. On average, daily highs range from 53°F (12°C) to 64°F (18°C) with lows between 43°F (6°C) and 55°F (13°C). The average temperature in January 1963 was −2.1°C, making the winter of 2009-10 seem positively balmy. Description The above climate weather data chart for London, Ontario Canada shows average monthly weather statistics with historic daily extremes. The annual rainfall is 398 mm | 15.7 inch. At -6.1 °C | 21.0 °F on average, January is the coldest month of the year. Weather climate statistics include monthly averages, maximum and minimum average mean temperatures, mean rainfall, mean snowfall & daily high and low extremes for temperature. Average annual temperatures for cities, towns and parks throughout Ontario are given below. In Ontario, the average annual temperature is 17.9 °C | 64.3 °F. London, Ontario, Canada - Monthly weather averages including average high and low Temperature, Precipitation, Pressure, Wind Charts to assist you in planning your travel, holiday or an outdoor activity at London, Canada Sign up for our email newsletter by entering your email address. London average temperature. Spring (March - May) As London transitions from winter to spring, the weather can vary from warm and sunny to cold and rainy. You can jump to a separate table for each section of the province: Eastern, Central, Southwestern, Northeastern and Northwestern Ontario. Weather history for places in Ontario. February 2021 Long Range Weather Forecast for Southern Ontario; Dates Weather Conditions; Feb 1-7: A few showers, quite mild: Feb 8-15: Periods of rain and snow east, snow west; mild: Feb 16-20: Sunny, mild: Feb 21-28: Rain and snow showers east, flurries west; turning cold: February: temperature -2°C (3°C above avg.) This location is classified as Csa by Köppen and Geiger. Come winter, the city’s streets and parks light up in a festive display that is a feast for the eyes. 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