Seems to be a correlation.

Decorating for Christmas early can boost mental health and happiness, according to science. The act of putting up decorations triggers dopamine, the brain’s natural "feel-good" chemical, and stimulates positive emotions through bright colors, lights, sounds, and nostalgic holiday scents.

It evokes memories of joyful past holidays. Besides, encourages a more optimistic view of the future, which is beneficial for mental well-being.