This is the view from Child 4's bedroom window as close to midday as I can get it every day since the first week in November. Since there, there has been only one day when the sky was clear for most of the day (21st November). Other pictures may look blue but these were generally just a convenient break in the clouds at 12.
There is research, I'm told, as to the long term effects on one's mental wellbeing of a lack of sunshine. I'm afraid that I'm too miserable to look it up!