When the days are short and the sky is cloudy, a lot of people get winter blues, with some even developing a form of seasonal depression called SAD. Main treatment offered is light therapy when you have to sit in front of a light box which imitates sunlight.
However, we also know that computer screens emit blue light and its brightness is equivalent to that of the sun, hence all the recommendations to protect your eyes in the evening. So it's my theory that spending more time in front of the computer/tablet, especially in the morning on rainy/dark days can have positive influence on those suffering from winter blues. I know that when the days are getting short and dark I tend to spend more time browsing, particularly in the afternoon since it's basically dark downstairs in the living-room at 4 o'clock.
If you have similar experiences, feel free to share in the comments!