The goal of the graph and cross sections is to help demonstrate the relative warmth of the various models. I shy away from temperature ratings because it is so subjective to each person's physiology. I have cold hands. And I know that. So for conditions that may only require an M1 Pro glove for some (like riding chairlifts on a cold, windy day in the teens), I'm probably putting on a mitten. However, it can be 5 degrees, but if I'm working hard and breaking trail on a skin track, an uninsulated glove like the TOUR will be perfectly fine. It helps to identify 'your' temperature rating and the conditions you plan to use the gloves in most often. Let your past experience and intended use help drive the decision when it comes to what will be most suitable for the next purchase.
Graph of relative warmth based on insulation package AND design. Mittens generally occupy a higher tier simply because your fingers share the same space which inherently makes them a warmer form of hand wear.
Insulation Cross Sections
(In order of relative warmth based on insulation AND design)