Testing at home is good to a point.
Your gear is probably still warm from the house, and so are you. If you and your gear have been chilled to the bone all day, its a diferent story.
Temps rise and fall differently in different parts of the country. Daytime temps can be warm (40-50*) and get down below freezing only for a few hours at night. Then there is the sub-freezing all day cold, say in the teens. Gear (and you) perform differently at these temps.