Bloody cold at funerals

Why is it always freezing cold at funerals? I was at a funeral earlier today (a work colleague's mother) and it was well attended so a group of us stood outside in sub-zero conditions because the funeral parlour was overflowing. The graveyard was equally cold. Naturally this is to be expected in January, but it often isn't that much warmer in summer at graveyards. Strange, eh?