This Charlie and Lola book is very, extremely great for snow days!

Big brother Charlie takes his sister out to frolic in a world that has all gone extremely white! Lola and their friends make snow angels, go sledding, and build a snowman (and snow doggy) before returning home for hot chocolate. The next day, Lola, disappointed to find that the snow has melted, wonders why it can't always be there. Charlie compares snow to birthdays–they wouldn't be special if they happened every day. He takes his sister on an imaginary tour of the Arctic, where polar bears swim, and the Antarctic, where smartly attired penguins look like they are going to a party. She realizes that it would be too cold there for her to go swimming or to wear her stripy party dress. Back home, Charlie surprises his sister with a memento from the previous day's storm–a teeny weeny snowman who lives in the freezer.