I've done a marathon, and it was excruciating, even with all the training I did.
The idea of doing an Ironman has got me thinking, but I don't know... I'm not much of a long-distance swimmer. Maybe if the swimming part was done with water skis or tire tubes.
As for running right now, if you can't even run in this weather (it isn't THAT cold), you're not tough enough to do an ironman
