I seem to have this as well (doctor didn't actually tell me that I have it but I get the white/painful finger episodes sometimes and have basically diagnosed myself). The right hand seems to go first, especially fingers 3-5, and sometimes it stops there and other times the left hand gets it too. As far as being outside when it's cold, I'm fine as long as I keep moving and have warm enough gloves on. If I stop for too long that's when it kicks in (like on a hike when the group stops for a break) and then it can be hard to warm them up again for a while--a big reason why I don't like long stops on a hike when it is cold out! The funny thing is that I sometimes get episodes INSIDE (although we do keep the apartment at 60 degrees usually), especially right after eating--that's weird. However, I think I'd rather deal with that than have the surgery a previous poster was describing (yikes!!) or take meds for it.