user7027: I'd like to use an Arduino Yún in a somewhat outdoor environment (in a metal box on a truck).  I think I've seen that the temperature requirements of the Uno are -40 °C to +85 °C, but I can't find that information about the Yún.  It would be nice to know where to find information about the temperature and humidity safe working requirements for every Arduino model.

user6740: The AtMega32u4 (the chip that drives the Arduino Yun) has an operating requirement of -40 to +85, so if you go outside that range, you will definitely void warranty (which is not to say it will break, of course!). See datasheet at http://www.atmel.com/devices/atmega32u4.aspx
A datasheet for the AR9331 seems to say that it only works down to 0°C ( http://www.eeboard.com/wp-content/uploads/downloads/2013/08/AR9331.pdf page 305, "Commercial Case Temperature") - this seems awfully high for a minimum temperature.
While that does not mean that, inside that range, you are safe, I would GUESS that you probably are - I would guess that the AtMega32u4 or AR9331 is going to be the most delicate part in there.
Of course, to get a definitive answer, you (or someone) would have to check the specs on each part.

7027: <p>I'd like to use an Arduino Yún in a somewhat outdoor environment (in a metal box on a truck).  I think I've seen that the temperature requirements of the Uno are -40 °C to +85 °C, but I can't find that information about the Yún.  It would be nice to know where to find information about the temperature and humidity safe working requirements for every Arduino model.</p>
 6740: <p>The AtMega32u4 (the chip that drives the Arduino Yun) has an operating requirement of -40 to +85, so if you go outside that range, you will definitely void warranty (which is not to say it will break, of course!). See datasheet at <a href="http://www.atmel.com/devices/atmega32u4.aspx" rel="nofollow">http://www.atmel.com/devices/atmega32u4.aspx</a></p>

<p>A datasheet for the AR9331 seems to say that it only works down to 0°C ( <a href="http://www.eeboard.com/wp-content/uploads/downloads/2013/08/AR9331.pdf" rel="nofollow">http://www.eeboard.com/wp-content/uploads/downloads/2013/08/AR9331.pdf</a> page 305, "Commercial Case Temperature") - this seems awfully high for a minimum temperature.</p>

<p>While that does not mean that, inside that range, you are safe, I would <em>GUESS</em> that you probably are - I would guess that the AtMega32u4 or AR9331 is going to be the most delicate part in there.</p>

<p>Of course, to get a definitive answer, you (or someone) would have to check the specs on each part.</p>
