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The Winter Itinerary
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Winter is a magical time in Ottawa when the city offers an atmosphere and activities not experienced anywhere else. Don’t be afraid of the colder weather – embrace it, just like Ottawans do! Preparation is everything, so from December through March, when the average daily low temperature is between -6° and -15° Celsius (21° and 5° Fahrenheit), be sure to pack mittens, a hat, a coat and winter boots.
http://ottawatourism.ca/en/travel-trade/itineraries/winter