Mist and fog covers fields as the sun rises over the Somerset Levels on January 13, 2012 in Glastonbury, England. After unseasonably mild weather, many parts of the UK were waking up to the first frost of the year. Weather forecasters have warned that there will be more hard frosts and freezing fog this weekend and temperatures will plunge across the country. Although the cold spell is only expected to last until Tuesday, the Met Office is also warning of a 'risk of colder conditions' at the beginning of February. (Photo by Matt Cardy/Getty Images)