I woke around 0530 this morning, feeling that something wasn’t quite right. I looked out the window and it was noticeably foggy/misty. Presumably it was the lack of traffic noise that alerted me.
Looking at my nearest online weather station, it appears that humidity levels were above 90% from midnight until around 0800 when it started to drop quite sharply, while temperatures overnight decreased from mid 60s to high 50s then started rising quite rapidly from about 0800.
I’m quite confused about that, because I thought there would a correlation between humidity and temperature, unless, of course, there’s a latency in the system?
Any weather experts who could explain this, please – preferably in simple terms?
oh ok no, as the temperature drops at night the humidity increases as it is measured as a percentage of how much water the air can hold. So for the same amount of water vapour in the air, the percentage goes up as the temperature decreases. That is why fog tends to occur at night, as the temperature drops the air becomes saturated with water vapour and begins to condense.