The DIGITUS® Plug&View OptiMax Pro (DN-16040) was 14 days in duration test and we tested the temperature range under severe conditions with success: it ranges from -20 to ~ +60 degree, including cold bootup and long time run!
So you can use the wireless outdoor Plug&View IP camera in IP 66 casing under more extreme conditions.
More information about the camera modell can be found here:
DIGITUS® Plug&View OptiMax Pro (DN-16040)