hallo, sehe zwar nicht, was Du davon hast, wenn Du es weißt ... habe aber folgendes in einer englischen BA gefunden:
Auszug:
"...Display outside temperature
Press TEMP key.
If the outside temperature drops below
37.5 5F (+36), a warning signal sounds,
the temperature display automatically
appears and flashes for 8 seconds.
The warning is repeated whenever the
temperature has increased to 43 5F
(+66) at least once before falling to
37.5 5F (+36) again.
aThe temperature warning device
does nothing to alter the fact that surface
ice can still form at temperatures
above 37.5 5F (+36), e.g., on bridges
and on shade-covered road surfaces...."
Vielleicht hilft es Dir!?
Hier noch ein
link