I went the other way, from Southern California to Reno--I never saw a flake of snow or a temperature much below 50 degrees until I was 29 years old. I loved the new area and the job, but the novelty wore off snow and ice pretty damn quickly. The first time my windshield froze up overnight, I had no idea what to do about it. I really didn't know windshield scrapers existed.
Riding, though, turned out to be at least as much fun in winter as in summer. You have harsher conditions in Nebraska than we have here (the snow melts off between storms, and we rarely have prolonged periods below freezing). I miss the beach, but I wouldn't go back to Santa Monica.
As for the move, though, I'd say that if riding is that important to you, go for it. It's an adjustment, but if it doesn't work out, you can always go back. My son moved to Denver a couple of years ago for a job--he's 1000 miles from the family, and everybody misses everybody, but he has new friends and a new life there and i doubt he'd return.