Ragachovers Assistant, thanks for that. It is Devarim Mistabrim. I was going to add to my comment that although I didn’t think there was a Shaala, his answers are good ones.
Sam4321, if you request it, the moderators can chamge it, I think.
As to staying on in the rain:
I heard that Reb Moshe stayed, saying that it doesn’t bother him. I’ve felt, and then saw in the Mishmeres Shalom (Kaydinov), that the Mashal in the Mishna only applies to Eretz Yisroel. In Chutz La’aretz, where it typically rains in that time, it is not a deliberate Simman.
Sam2, why would you apply Daas Kol Adam here? Mitzta’er is an individual based rule.