For me, moving from Seattle to Kigali was all about just deciding to do it. After the decision was made it was far, far easier. I've got a wife and kids too. I think if this is something you want, just taking the plunge without thinking too hard about it is the only way it can really happen.
As for the climate, I can say that in Rwanda it is amazing. Pretty much beautiful weather every single day. It's near the equator, but at elevation. So it hovers around 80 degrees most days with a gentle breeze. It can get hot in the middle of the day, but not uncomfortably so. Rainy season brings torrential downpours for an hour or so twice a day -- which is always welcomed.
You've got me sold :) How old are your kids? (mine 1, 3 and 19...). If you want to make some quick money you should take out a life insurance on me just before I explain the plan to my s.o.
Kids are 7 and 9. But Nic is spot on above. It really is just a bunch of small steps except for maybe a biggish one to get started. Thankfully that's the only hard one. But ya, the other thing you can do is reach out to the folks in the region you are interested in and just see how you can get involved. Relocating may in the end just seem like a natural next step.
To be honest, Kigali is one of the easiest places to do this in Africa (if not the easiest) when looking at all factors, so we are bit spoiled in that regard. I was surprised, when talking this over with my wife she was on board right from the beginning and even moved here sight-unseen. So, I'm grateful for that. Having kids also adds the extra hurdles of finding schools and such, but nothing too difficult.
As for the climate, I can say that in Rwanda it is amazing. Pretty much beautiful weather every single day. It's near the equator, but at elevation. So it hovers around 80 degrees most days with a gentle breeze. It can get hot in the middle of the day, but not uncomfortably so. Rainy season brings torrential downpours for an hour or so twice a day -- which is always welcomed.