I mean, I deliberately avoided using terms like “hot summer days” and “usual winter day” because that’s far more dependent on where you are. Where I am it’s:

• Really hot summer days (35 ℃)
• Usual summer days (30 ℃)
• Room temperature (24 ℃)
• Spring / autumn days (25 ℃)
• Chilly outside (18 ℃)
• Cold outside / usual winter days (15 ℃)
• Winter nights (10 ℃)

So I used words that are about the experience of a person in those temperatures in comfortable light clothing, rather than times of year. And obviously there’s some subjectivity there, with some people being more comfortable in cold temperatures than others. But still, we’re talking about the comfortable mid point varying from mid 20s to high 10s. There’s no reasonable world in which 50 ℉ (10 ℃) is the midpoint.