Schools have closed across the UK as more and more snow covered the country in the deepest “frost extremes” in decades.
About 70 schools are closed in County Durham, as have many schools in Essex, Suffolk and Derbyshire.
Roads as far south as Kent were made impassable by thick ice, and the M20 – the main route through the county – was closed in both directions.
Forecasters warned the roads would be too dangerous to use and canceled rail links.
National snow and ice severe weather warnings have been issued for most of the UK by the end of this week.
Meteorologist Chief Meteorologist Dan Suri said: The weather will continue to be very cold for the rest of this week, with daytime temperatures reaching many degrees above zero at best and even colder due to strong easterly winds.