Most schools in St. Charles and Jefferson counties closed Thursday while nearly all in St. Louis County opened with mixed results.

Lots of you have been telling Newsround about being off school, but who decides if a school closes and does snow always mean a snow day? Read on to find out. A headteacher would usually make the decision on whether to close the school.

Schools in several states will remain closed on Thursday after a winter storm brought over a foot of snow in some areas.