I was just thinking how laughable such a system would be here in
Ottawa, about 350 miles north of you. It would be reporting "a layer
of ice" pretty much from Christmas through the vernal equinox.
--
Andrew Chaplin
SIT MIHI GLADIUS SICUT SANCTO MARTINO

Citroen C5 has temp sensor, and bells in two cases, with a message on
the main screen:
- you start the engine and the temp is below +2°C
- you started the engine long time ago, and the temp comes down under +2°

Don't need any complex and expensive system: temp sensor, buzer, timer.
All manufacturers could do that since 30y, and on all models since 20y.

***

A more expensive, but still cheaper way than GPS, and more universal
system, could use GSM (GPRS) network to connect internet, and read
weather information in weather stations ...

***

The problem is significant for people who rarely have ice, only a few
days per year, and are not accustomed to. Of course, we should always
expect ice; but, for example, *I* have snow only 5 times a year, so, I
will not drive all winter long as if I was expecting ice; last winter
meant for me +12°C to +18°C :) That's why ice days were dangerous around me.

And in this case, a "smart thermometer" is way enough.

Not as bad as re-inventing the wheel :=)

If computing were an exact science, IT engineers would not have work \_o<

"So all that's left, Is the proof that love's not only blind but deaf."
(FAKE TALES OF SAN FRANCISCO, Arctic Monkeys)