Summer, I guess the cloud is low where you are which could make it feel humid.
Just returned from that client meeting which was straightforward as I expected, while I was there I started hearing a faint beeping noise coming from somewhere. The client couldn't hear anything but I could. After a couple of minutes it stopped. She said she was going to check if her 90 year old neighbour was OK as it could be that the beeping sound was from his house. He's recovering from 3 broken ribs after a fall and is suffering from dementia though rejects any help and his closest relatives are miles away.