Hi Rhoditis,
Good question. We have tested our product for accuracy up to 45°C. Above the tested temperature range accuracy will be less than specified in datasheet. We also had in mind our polymer enclosure which is good up to 100°C
So yes, you can use it in conditions above 45°C but not exceed 100°C as it will start to melt plastic enclosure.
Above 45°C sensor will be less accurate but it will not drop to zero. Reading will stay somewhere close to reading in lower temperature.
Thanks