Since 1947 the people of Norway have provided London with a tree out of gratitude for the support Britain gave the country in World War II.
This year the annual tree lighting ceremony will take place in Trafalgar Square on the 4 December.
Decorated in traditional Norwegian style with hundreds of white lights, the lighting of the tree helps mark the start of the festive season in the capital.
The tree provides a focal point for the Christmas Carol singing programme which runs from Monday 8 to Tuesday 23 December and will remain in Trafalgar Square until 6 January 2013, Twelfth Night, when it will be taken down for recycling.
Back to the events calendar.
4 December - What will the weather be like in Trafalgar Square for the capital's annual tree lighting ceremony?
Do you need to wrap up against the winter cold? Check the London weather forecast.
If you're looking for content for your own website, take a look at our weather widget.