Paul Hyett wrote:

Where did you get such dry air from?

I don't know, Paul, perhaps a figment of my sensor's imagination? We
usually seem to have a higher RH reading than most other places. Is
there anywhere I can find some figures from yesterday to compare it with?

Currently reading 20.2C, DP 14.4C, 70% RH.
--
Steve Loft, Wanlockhead, Dumfriesshire. 1417ft ASL
Weather and webcam: http://www.wanlockhead.org.uk/