(First time posting on worldbuilding, be gentle!)
For reasons currently unimportant, Earth has been encased in a solid shell which is for all intents and purposes completely invulnerable. The shell cannot be damaged by (for example) meteor strikes or large explosions, and does not allow radiation to pass through it in either direction. By this I mean electromagnetic radiation (including light), and heat. All such radiation is reflected by the inner surface of the shell. The shell appeared in a relatively short time, taking a matter of days or weeks to be placed around the planet.
Assume that through some means the shell remains steady about the Earth and there is no chance of it drifting and colliding with the planet. It is positioned high in the atmosphere, somewhere in the exosphere (roughly 600-700km up). If this conflicts with any existing satellites then they can be assumed to have been destroyed. Then my question is:
How would this affect the climate?
Specifically: without the sun, would there still be wind and other types of weather? How would the temperature be affected over time?