
I think one of the reasons schools shut in the snow nowadays is that the staff can often live a long way from the school and have to travel in whereas when I was a child schools usually only catered for local children and the staff too lived locally so could always get in if it snowed.
I work in a school - the largest primary school in the east of our county with over 650 children from reception age through to year 6. We have 25 teaching staff and only a dozen or so of those live within 15 miles of the school and some staff travel at least an hour and a half to get here each day. Despite the snow our school did remain open but at least 9 teaching staff were unable to get in due to the condition of the roads - most of us who were able to get to school walked in - it took one teacher over an hour to get here. Over three quarters of the children turned up for school and it was generally only those who live out in the countryside who didn't make it in - along with those few who you can always guarantee won't turn up for the slightest of reasons :-)
Every class had a member of staff in it but not all of those were teachers - we have 9 HLTAs who work in the school and they covered classes until we were able to get some local supply staff in to cover the absent teachers - some of whom were able to get in later during the day.
I got to school at just past 7am and helped the caretaker clear paths and spread grit - a huge school so a lot of paths and if we hadn't been able to clear the paths or get enough staff in to have the correct ratio of staff to pupils we would have had to close on the old H and S grounds or risk being sued if an accident had happened. We did manage to stay open but only because we were able to achieve the minimum standard required.