Fog can feel gloomy if it hangs around all day, but I don't mind if it burns off by noon.
I enjoy the challenge of drawing fog. It completely changes the way I see ordinary views. Fog teaches me how far away familiar things are. With nothing but tones and values, and most details hidden, those ordinary views seem fresh again.
On one morning, the sun appeared briefly as a flat white disc, then disappeared. I kept applying a light layer of graphite to the page, knowing that the sun would reappear. When it did, I pulled out my eraser.
The temperature on these foggy mornings was in the 30s and low 40s F. These were all sketched through windows in my house in the Maple Leaf neighborhood.