Of these 4, rain is clearly the worst, since it will always stop play, and the other 3 won't. However, you left off snow. That's right, snow. I played a tournament a few years ago in Abilene where the first day got snowed out. The next day, it thawed out, the snow turned to water, so we squeegeed off the courts and continued the tournament.
One time I played when it was 5 below. Didn't stay out very long though.
I can't complain, but sometimes I still do. Life's been good to me so far.