Perhaps contacting Davis might help. I doubt they considered having a temp probe that would be valid well below normal human living conditions. Both the Davis Envoy and the Console show the range of the inside temp as +32°F to +140°F. I
do not suggest you attempt to verify the upper limit.
![Lol [lol]](https://athena.trixology.com/Smileys/default/lol-1.gif)
Appendix B: Specifications
Envoy manual, p. 28 / Console manual, p. 50
Sensor Outputs
Inside Temperature (sensor located in Envoy / Console)
Range . . . . . . . . . . . . . . . . . . . . .+32° to +140°F (0° to +60°C)