OpenSprinkler › Forums › OpenSprinkler Unified Firmware › Watering percentage not changing › Reply To: Watering percentage not changing July 6, 2015 at 1:07 pm #39079 RayKeymaster @gary: can you specify your location? In general, Precip T” or -999 means Wunderground is reporting invalid data. This is not something we have control over. You can try to use a different weather station to see if it improves.