How is the "feels like" temperature determined and by who?

Question

When you look up the weather results they give you the actual temperature and the temperature that it " feels like". Who decides and how is the "feels like" determined?

Answer 1

The wind chill is a measure of sensible temperature that uses the effects of wind and temperature on the colling rate of the human body. The wind chill chart translates the cooling power of the atmosphere with the wind to a temperature under calm conditions. The heat index is what the temperature "feels like" when you take the humidity into account. There is a chart for that as well.

Answer 2

In the winter it's determined by wind, and in the summer by humidity. It's a national standard, as far as I know; but I don't know exactly how I do it. I do know, however, that wind makes you feel colder (wind chill) and humidity makes you feel hotter (the heat index).