Thanks to all that replied. Based on what I read, my understanding is the following: 1. Mikrotik's Routerboard itself does not necessarily stand the harsh temperature of -40 C 2. But, there are scenarios where Mikrotik's Routerboards are used in -30~-40 C environments, in northern Europe or Canada. ...
Yes, -20 C is the official number from MikroTik. However, they told me that they have deployment in northern Norway as well as other places where the temp. can reach -30 C during winter.
If anyone has first or second hand knowledge, please let me know.