Damn, good on you, mate. I was pretty pleased with myself for commuting about 1/4 to 1/2 that distance. I don't think I could hang with 16 miles each way.
I have found the logistical hassle of bringing all my stuff along to be difficult to overcome, at least as far as wet weather commuting. The messenger bag gets damn full with water bottle, lunch, work clothes, and sometimes kung fu uniform & gear, lock, pump, repair stuff, etc. Factoring in a towel, change of shoes & socks, plus keeping all the shit dry (how do you manage that?) seems like too much to fuck with. It'd be nice to keep the cycling going through the rainy season, though. 3-4 months of riding per year is nice, but 8-12 would be better.