Wireless thermometers in sub zero temps

[smokey robinson]

Hello! 

I have been cruising the forum for info on wireless thermometer performance in winter, but haven't found anything specific about when it's really freezing out, like Canadian freezing out. 

I'd love to hear about people's experiences with operating their Mavericks and igrills, or any other wireless units in the subzero temps of the north ! good idea? bad idea? some kind of DIY hack ? 

Thanks!