Atmospheric effects (Rain/Snow) On/Off

By pressing this key (F6) you can enable/disable the "atmospheric effects" like rain or snow.

Code 
set opady0 "echo ^6RAIN/SNOW ^7 is now ^1OFF; set cg_atmosphericeffects 0; set opady vstr opady1"
set opady1 "echo ^6RAIN/SNOW ^7 is now ^2ON; set cg_atmosphericeffects 1; set opady vstr opady0"
set opady "vstr opady0"
bind "F6" "vstr opady"