Ah - well yes.
It’s time-step based so we have a calculation for every hour from the historical weather data for your site (yes we have a calculation to work out if, at that time, it’s “glorious”).
Until we have a support article, you should know anything from 68F to 86F, without high winds, fits in the yellow space. Residential covers all hours from 6am to 10pm so the % of hours in the middle of the day is constrained relatively as well.
Anyway, definitely know when I will be coming to SE Minnesota now…