Paul writes in the Book of Romans chapter 10 about the means of salvation coming upon a soul. He says in verse 13, “for “Whoever will call on the name of the Lord will be saved.” But immediately knowing his listeners response will be what about those who have not heard of the Lord Paul says rhetorically in verse 14, “How then will they call on Him in whom they have not believed? How will they believe in Him whom they have not heard? And how will they hear without a preacher?”
Of course Paul the ever-present recipient and imparter of divine wisdom comments on the word preacher in verse 15 when he says, “How will they preach unless they are sent? Just as it is written, “How beautiful are the feet of those who bring good news of good things!”
Finally he comments on the unbelief of some Jews, that though they heard they did not believe, and that ultimately salvation comes from hearing the Gospel first and believing it second. Paul writes in verses 16 & 17″ “However, they did not all heed the good news; for Isaiah says, “Lord, who has believed our report?” So faith comes from hearing, and hearing by the word of Christ.
The point is that the salvation of a soul comes from their hearing the Gospel first and believing it second. Are there conditions on where the Gospel is heard? Is the Gospel only effective in certain locations? The Gospel is the power to save for the Jew and Greek (Romans 1:16) and there is no stated condition of what location in which this Gospel must be heard for it to be efficacious.
Hence the Gospel heard in zero degree weather is the power to save as much as if it was preached and heard in a building, on the radio, via the internet or TV.