Dr. Samra interviewed by CTV’s Brett Mineer about Blue Monday and what it really means. Is everyone depressed? Blue Monday falls on the third Monday of every January – when the weather is typically awful, many have given up on their New Year’s resolutions and the Christmas bills arrive in your mailbox. Blue Monday is actually a term coined by Welsh professor Dr. Cliff Arnall, who came up with the term for a travel firm. It has no scientific basis and makes no sense in mathematical terms.