A mathematical formula has again been devised by a university boffin to reinforce the gloom with science.
So Diary doffs its cap to Yorkshire agency Green Communications, which has decided to brighten up Blue Monday by creating a beach in its offices.
The 'Costa del Wakefield' will have sand, deckchairs and a cocktail bar. Media director Ian Green even says staff will be wearing Hawaiian shirts for the day.
The stunt is in aid of a good cause - part of Green's pro bono work for Samaritans.