April/May in Europe should be OK. Snow falls at that time in Germany are not uncommon, but it won't be much and the roads will be cleared quickly. You are just as likely to have 15 to 20 C and much more likely to have some wet weather there.
S Italy and Greece at that time is spring and it should be magic, with flowers everywhere. Much nicer than summer.
The only area where I can see a problem is Anatolia/N Iran. There have been posts on the subject, so have a poke around the HUBB. I think it will be OK.
The rest of your trip will be in hotter climes, so no problem there. India should be purrfect in Winter. I was in Kathmandu for Xmas and it was well above freezing, we camped in Pokhara and it was warm in the plains.
Have fun and I may see you on the road, going the other way!
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