Learning Mode is a time span during which AcuRite products utilize a unique algorithm to analyze changes in pressure and temperature over time to determine your altitude. During Learning Mode, AcuRite products have a Learning Mode icon on the display screen.  

The Learning Mode algorithm begins with the global average pressure (29.92 inHg). The weather station then takes 4,000 readings at 12-minute increments to calculate a running average and compute the barometric pressure for your exact location.

The pressure accuracy of AcuRite self-calibrating forecasters increases with each new reading over the Learning Mode time period. After 14 days, the Learning Mode icon disappears from the weather station screen (example pictured below). At this point, the self-calibrated pressure is reasonably accurate (although the algorithm continues to run; 4,000 readings = 33.33 days) and the weather forecaster is ready for superior weather prediction.