November is gray. They most gray day is the November 16th: the sun is not much higher than a month later, it tends to be wet and cloudy and there is no snow to reflect the light. It is so gray it turns out to be good marketing: https://www.forbes.com/sites/jeanettehurt/2018/12/09/finnish-company-outwits-liquor-advertising-ban-by-using-gloomy-skies-to-promote-product/#95894d5220c4