In cooler weather, I normally use my MH PowerStretch Gloves(size M) which weigh 1.2oz. Even in 24F weather with wind, they kept my hands warm as I hike using poles (though my core also was plenty warm which helps the extremities). When colder or wet, I also add or swap out to my MLD eVENT Rain Mitts (Med at 0.9oz). In the summer, I just use the Mitts. Instead of the MLD Mitts, you can also look at ULA's Mist OverMitts (1.2 in M).
The advantage of 2 gloves instead of just one is you can use them for a much larger range of temperatures and weather conditions. Just carrying one pair that can do everything would be too warm for some things.