Re: Door Frame Dry Rot Help
Without seeing what you're talking about, it will be hard to offer a fix. You will need to host the image with an offsite host, then link the image here.
As for changing out a door in winter, yes, you can. An experienced tradesman can do it in about 1-2 hours, which is quite a long time to have a gaping hole in the side of your house when it's cold outside. What I would do is either remove the screen door for the time being, or install a thin block over the damaged spot to attach your closer rod. When the weather gets better/warmer, then address replacement.
If the damage is superficial, then you can patch it, however, until more is known, a course of repair cannot be suggested.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!