In the wake of Donald Trump's inauguration, the US is bracing for cold temperatures caused by the Arctic 'polar vortex'.

Extremely cold temperatures are expected in the US, with -31 degrees Celsius forecast in some regions. This is caused by the Arctic 'polar vortex', and very cold temperatures are forecast for Washington D.C., worsened by wind. According to forecasters, the temperature at Donald Trump's inauguration could be -6 degrees Celsius, with the coldest inauguration ceremony in decades forecast.