In article ,
jbm writes:
Very, very unofficial, Jan 1977, 6 miles north of Lanark on top of a
mountain (c1000ft ASL near the village of Forth) at an open cast coal site
on their site max/min thermometer.

-28C minimum overnight, -16C maximum the following afternoon.

I know, because I read the thermometer each day, and I was working out in it
all day. Surprised the hell out of me when I saw it, because they had been
about -15C and -5C respectively for several days prior. Snowed like the
clappers a couple of days later, and the only way to get to the site was to
use the bulldozers and excavators to dig our way in. Oh what fun. :-)

Was the thermometer in a Stevenson screen?
--
John Hall "[It was] so steep that at intervals the street broke into steps,
like a person breaking into giggles or hiccups, and then resumed
its sober climb, until it had another fit of steps."
Ursula K Le Guin "The Beginning Place"