Feels like: it doesn't always feel like what the thermometer says, wind chill and humidity can make it feel warmer or colder.
barometer: how much air pressure there is.
Humidity: it's 76% of the maximum amount of water that the air can hold. The hotter it is, the more the air can hold.
Dewpoint: the temperature that it needs to be for dew to form.
Visibility: yes, the distance that you can see.