In the early morning we see dense mist and severe cold. but in the afternoon we witness excessive heat. Why?In the early morning we see dense...

Are you near the ocean? I used to see this effect when I
lived in Central California. The weather changed quickly and dramatically. This happened
because right off-shore in the Monterey area, there is a very deep ocean trench. The
ocean is already cold there, and the deeper it is, the colder it is. There is a low
mountain range right at the coast in this area, and the Salinas valley is quite hot.
When the heat from the valley hit the cold ocean water, fog/mist formed. Sometimes the
fog stayed off-shore, and you could see it from land; it would be sunny and hot at the
beach, but the fog could be seen, several miles out. Frequently, though, especially in
the mornings, the fog came all the way in and covered the land, up until it hit the
mountains. The temperature varied greatly between the foggy areas, where the sun wasn't
out, and the sunny areas, which got the full blast of
sunshine.

As we change our environment, the fog/mist may be
affected; long-term effects are unclear. I've attached a link about
this.