Originally posted by Pyro Penguin:

"workbench is too exposed"
even when there's a roof over it and 3 sides of it are touching walls, i wish they would just remove the requirement for it to be indoors

On the minimap, up in the right hand corner of the screen, there is a small arrow which indicates WIND DIRECTION... If the "open" (4th side) of your protective structure is facing into the wind whatsoever, the workbench will still be considered "exposed"

Checking the wind direction should always be the first thing you do before setting up a workbench (outdoors) with roof and walls, rotate the workbench where the wind is hitting the back and make sure you place walls there and then a roof on top. ("open" end facing downwind)

Another way to determine wind direction is to look at the "streaks" in the air floating by.