Side note... we got one of those last year and now we use it by default over making a fire in the pit. So much easier and cleaner... and you aren't dodging smoke with every shift in the breeze.
Maybe... but its consistent so I know where its warmer or cooler. Maple Valley was the warmest spot today that we saw. I am pretty sure our car we were driving today is really close to reality just based on years of driving it and intimately following weather.