There has been an ongoing topic for over 1 year talking about this. I just went to that post Outdoor Applications and no new update had happened. Seems to me this is a simple test.
The product sheet https://www.adafruit.com/datasheets/EdisonDatasheet.pdf says 32 to 104°F (0 to 40°C).
I am not sure that Intel wants this product to have success.
Yes, I am very sad about this, it was a long hard fight with the rest of the team, but in the end I have to answer to investors. Investors don't want to hear how I spent weeks attempting to force a product to work. I have always supported Intel, I still believe in them. I just think they dropped the ball on this device.