Humidity dipped quite dramatically this afternoon. In our kitchen, just inside the back door. The hygrometer went from 60% RH as its been for the last week to 30%. It's now back up again.
Looking at the Heathrow metars I see the dewpoint dipped from 13 to 5 and is now up at 14 again. Would be interesting to know why this happens, as it's not the first time this year.
Anyway, it meant the clothes dried wonderfully on the line today.
Brockley, South East London 30m asl