How to close the sky in CS 1.6?

You can turn off some weather effects to improve FPS, but you have never seen darkness.

Cl_weather "0" // Turn off the weather.

Cl_particlefx 0 turns off all detail effects (such as rain, shrapnel, bullet casings).

Cl_particlefx 1 close some details.

Cl_particlefx 2 opens all details ... The default value is 2, which can be changed to 0 or 1 depending on your machine.

GL _ water lamp "0 "// Don't show water waves.

R_waterwarp 0 // Response of water surface closed weather

You can enter these parameters in the console, or write them in the config Notepad under the cstrike folder in CS. The above settings can improve FPS to some extent.