If the WUnderground station being used by the controller reports the same temperatures for an extended period of time does not detect this and calculates the wrong Max and Min temperatures for the day. This results in a potential gross under watering. Case in point, I was on vacation for several weeks, when I returned my lawn and plants were half dead from under watering.
My system was set up to use data from both NOAA and WUnderground. For reasons unknown the WUnderground station was reporting a continuous temperature of 64 degrees. This caused the rainmachine to reduce the watering times by up to 80%. Oops- dead plants!

The rainmachine's software did not flag this problem. Since most users expect the controller to a "set and forget" system and not be checked by the use very ofter, this is an unacceptable flar and needs to be addressed