3-3.5lbs is as light as the average person should go for any gun seeing field use. Nor would I go any lighter on any centerfire semi auto.
Pull weight alone is not the most important factor for good shooting, and a good trigger with a heavier pull weight can be better than a poor trigger with a lighter pull weight.
the main reason a hunting gun should have at least a 3lb pull is simply safety. Another is accuracy, and in this case I'm talking about hunting accuracy and putting the shot (first shot especially) where you want it to go. In every kind of weather you're going to be shooting in.
Gloves/cold stiff fingers decrease your sensitivity and too light a trigger is a really BAD idea if those are the conditions you're in. A very light trigger can be fine at the range or in the varmint field in August and a very dangerous thing in the deer woods in November.
When its about freezing (or colder) and you've been out in those temps for hours, you could fire a too light trigger before you're even fully aware your finger is on it.
And the same also applies at any temp for a gun that might need to be used in a hurry. A heavier trigger wil mean the gun goes off when you are ready and not before then.
And a too light trigger on a semi auto could result in the gun being "jarred off" and firing simply from the the action closing. Not a good thing.
3lbs has been the accepted standard for a light, safe trigger for generations, and I think its a good place to be. I have a couple guns with lighter triggers, they are exellent special purpose rigs. For general use, and any kind of all weather hunting, 3lbs or more is the way to go as far as pull weight is concerned.