Maybe we don't have it as cold in the winter.
I think that rain water differs in purity as the air in some places is more clean than others. I wouldn't drink it without filtering it I use it for plants only. If I were to drink water it would be from condensate and run it through my brita pitcher. I hear condensate water can be like distilled water minus the path it has to go through to get out. I just read a few articles and most say in areas without air pollution it is safe to drink but recommend filtering it.
As for my knowledge of dew point, I learned that long ago as a kid watching weather forecasts and wondering what it was. I sort of figured out what it was when there was dew on the ground when it was that temp but considerably higher there wasn't any.
I just read a few articles and most say in areas without air pollution it is safe to drink
That's what I thought, but exactly what the 2022 findings (recent/current study) I linked to has refuted - which is why I was "shocked". They did in fact test globally, including places they expected to be 'OK', and found out that isn't the case. It's a very recent study. Of course where I am now, it really only rains in 2 periods during the year, so I won't be collecting it anyway - at least until the CO river runs completely dry, which at the rate things are going may not be that far away!
The dew point thing is funny. I may have used the wrong word: I have long
understood it technically, just from a scientific standpoint, and what it did to me when I lived some of those other places. However, it was not before living in the desert many years later that I now fully
comprehend it from the standpoint of its full effects with respect to the human body, and exactly why it has those effects. The key is not just understanding dew point (including perhaps absolute and relative humidity) and ambient temperature, but fully understanding the relationship between that and
human skin and body temperature. Anyway, you have a pretty good handle on it. You would only learn more by actually spending time in a place where the dew point changes to the extreme extent that it does in, say the desert Southwest over time during the year. Basically, one must experience not only the high dew points, but also experience the super-low dew points (
single-digit, and even negative numbers at times) for the last 'light bulbs' to turn on and full comprehension is reached. That is one of those things that truly must be experienced over time to be fully
appreciated. That's why I generally no longer even discuss it with anyone who hasn't actually lived in single-digit dewpoints to fully 'get' the other extreme for context and
complete understanding. That's another reason why as soon as anyone cracks the old "dry heat" jokes, I immediately shut up and don't even discuss it with them at all, because at that point I
know they don't 'get it', have never experienced truly low dew points to any extent, and discussion is pointless. Anyway, you seem to have a good handle on it for someone who possibly hasn't experienced all that (I don't know where else you've lived). That's a compliment (not an argument), so just take it at face value