Depends on many factors but your location isn't known for low humidity. A lot of the tough finishes in the tour happen on mountain tops where temps areen't as high. On the flatter finishes where it might be hotter they're not working as hard. Being close to 2lb per inch of height also helps significantly. Lighter riders have a disproportionately high surface area to weight ratio compared to heavier riders so managing heat is easier for lighter riders. And genetics clearly play a role as well. At 165lbs I'm not a lightweight but never have a problem with sweat in my eyes while riding. I might notice it when I stop but not when riding.