Your body is obviously warmed by the sun, so you might think: why not tell me how warm I’ll get? Trouble is: different materials absorb sunlight differently. If you put a black metal thermometer right in the sun, it will get much hotter than, say, a thermometer encased in white-painted wood. So you’d have to basically put a thermometer inside of a human body, in order to figure out how much it will be warmed by the sun on a particular day.
Not only that, but how much you are warmed by the sun also depends on your particular body, what clothes you are wearing, how much sun you are exposed to, and so on. So it’s impossible to get a single objective measurement that will be accurate for all or even most people.
Temperature in the shade, however, is very easy to measure objectively.
To compensate for factors like wind chill, humidity and sunlight, weather reports will often include a “feels-like” temperature which tries to correct for these things as much as possible, but again this won’t be accurate for everyone in every situation.
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