Weather affected my knee for months. It's much better now. The older your new knee gets, the less you'll feel the weather. Lefty still lets me know a storm is coming, but my new knee is wonderful! I've recently gone off of my Diclofenac, so it's a little stiff, but it's rest of me is complaining with more pain than my knee is!
The greenway sounds perfect for a good starting point. I wish we had something like that around here. All we have is either rural roads or loads of traffic in the cities! The only bike paths are the 'rails to trails' I was telling you about. And that's 1 1/2 hours away. I do ride in my neighborhood, which I'm so thankful I can do now!