Two things, first to the 1+rad/sec during rain thing, yes that is realistic and realistically you would either find cover or only be exposed for a brief amount of time. And secondly my question is would the rain occur according to season or just have a random chance of occurring as you exit a building? Cause I mean if I go into a building and its completely sunny clear skys and I exit 30 seconds later and its a thunderstorm.... Possibly have it be over cast for about an in game hour then start raining? AM