How Do People Predict The Weather?

People are sensitive to the changes in the air pressure, and some are more sensitive than others. Example, it snowed here the day before yesterday, and I was outside for a few minutes, then about an hour later I went back outside, and I could tell that there was a change, so I told the people that I was talking to at the time that it was going to snow, and they didn't believe me. Sure enough, it snowed. ^_^
You can feel it in the skin, the ears, sometimes in the sinus cavity, for smell, and sensing the density of the air, or the thinness. Depending also on the type of weather that is coming, you can start to hurt from cold weather, cold or warm rain, the absence of these, might indicate that the weather is going to get better. It just depends on who the person is, and how long they have lived in that area. It can be a learned trait to have. Hope this helps you out.