The same is true for “twice as warm.” 80 degrees isn’t “twice as warm” as 40 degrees, because temperatures don’t start at zero.

“Twice as cold tomorrow” is really just a way of saying, colloquially, that it’s gonna feel a hell of a lot colder tomorrow.

You can’t answer the question because you have no baseline. Zero is just an arbitrary point on the temperature scale. If yesterday the temperature was 10, then tomorrow it will be -10. If you’re going against the average (say, 52 in Utah) then tomorrow it will be -52.

You’re getting hung up on it being zero degrees. The real problem is that you have no baseline to establish what, exactly, tomorrow will be twice as cold as.

seriously, “twice as cold” is a multiplier… however, anything multiplied by 0 is 0.

so, literally, the mathmatical answer is 0.