Oops, it doesn't look like 'weather service is forecasting cold temperatures and wind chills for all day' is a national day..

Other days

Frozen Yogurt Day

Pampering Day

Donate Your Hair Day

Promposal Day

Embarrass Your Best Friend Day

Cuddle Up Day

Tell Ur Crush You Like Them Day

Polyamory Day

Girl Friend Day

Bubble Bath Day