In uk.sci.weather on Thu, 25 Aug 2005 at 18:43:39, Norman Lynagh wrote :

I have noticed for some time now that the forecast minimum temperatures
seem to err on the high side on radiation nights.

I totally agree - in such cases I almost inevitably record several
degrees below what they forecast - and I'm by no means in a rural area.
--
Paul Hyett, Cheltenham