We've trick-or-treated in rain and snow too (in fact, this was a nice year compared to others, we always do thermals and turtle necks under the costume) but our district has always done the weeknight before Halloween (eg., Thursday if Halloween is Saturday), as a rule to keep the kids safer. I think that the concern is older kids and teens staying out late and causing trouble, parties, potential drunk drivers, parents being less available or diligent about curfew, etc. I don't know if there's a real difference for safety, but, that's the reasoning where we live.
I'm confused that some people are trick or treating? Halloween is Saturday
My town always has trick or treat on last Thursday of the month. The reason is because of the major Halloween block party in my town and it would be a serious safety issue for the little kids. The party is always the closest weekend to the actual date of Halloween. So our town a long time ago took precautions that the party wouldn't interfere with trick or treat.
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