Anne Burgess wrote:
Anne yes 4 deg C would be about right for untreated road
surfaces.
Will.

Thanks Will. Not that there's any need to worry today - it was
registering 23.5ºC right on the coast just now.

Anne

The relationship between air and road temperature is not fixed, it is very
dependent on road construction, state of sky, evaporative cooling, season,
sky view etc. Overcast skies and an air temp of -1C can be associated with
positive roads, and a air temp of +4C in a breezy, low dewpoint airmass with
evaporative/radiational cooling can lead to road ice.

--
Stuart Brooks
Carluke
South Lanarkshire 223m amsl

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