Based on historical data, London has experienced only 19 white Christmases in the past 170-odd years, making snow on Christmas Day a rare occurrence. For the Met Office to declare a 'white Christmas', a single snowflake has to be observed falling on the 24 hours of 25 December. Recent years show mixed results: 2023 was the last white Christmas in the UK with 11% of stations recording snow falling, although none reported any snow lying on the ground. Before that, 2022 saw 9% of weather stations recording falling snow, but none with any snow settling.

December 2025 weather forecasts suggest daytime temperatures usually reach 8°C in London in December, falling to 2°C at night. There are usually 14 days with some rain in London in December. On average, there are 3 snowy days in London in December.

Resolution: This market resolves YES if any snowfall is officially recorded by the Met Office at any London weather station during the 24 hours of December 25, 2025. Resolution will be based on Met Office weather reports and data from official London weather stations including Heathrow, St James's Park, and other designated observation points.