Here are the numbers we use when training new pilots on the medium helicopters (B204,205,212).
In a OGE hover with a given torque you will get with wind up to:
10 Kts 250 lbs extra lifting ability
20 Kts 800 lbs extra lifting ability
30 Kts 1500 lbs extra lifting ability
Now what it means here is not to use these numbers to LIFT more, but to
be careful when windy condition prevails because you could overgross your aircraft without realizing it.
So yes, it does affect your OGE performances.
JD