~One mans opinion / observations~
Don’t get much experience with low temps (but that’s OK with me).
I think that it’s the surface temp, theory: (actual surface temperature of the vehicle)- 60 – 80oF products will work well within a much broader temperature range, (50° to 90° F) but the best results will be achieved in the 60° to 80° F range) that makes the most difference and the surrounding temp would need to be approx 5-10oF higher.
Perhaps some colder climate detailers have other thoughts on this.
~Hope this helps~
Knowledge unshared is experience wasted
justadumbarchitect / so I question everything/ Jon