Welcome back to commuting, if winter riding isnt your thing that ok, just glad your back on your bike. As for sweating I am really trying to think of a solution, I wear a helmet that is more like a bmx/skateboard helmet and has great vent holes in the front so it keeps my forhead pretty dry in the summer, I would head over to your local bike shop and ask them for advice, you dont have to buy there but they can give you an idea of helmets that might have sweatbands built in. I wear a baseball hat in the summer under mine to keep the sun off my face and keep a good fit, as I wear a beanie underneath all winter and hate having to change the padding. Its not uncomfortable at all, so if you have been using a tradional bike helmet try switching to the fuller coverage helmet. It might help. Good luck