What is the model number of your weather station? How long has the display been set up? It does go through a 14-33 day learning mode where it uses an algorithm to determine your altitude and adjust the pressure. If the learning mode has not completed we would recommend letting it complete the learning mode. If it has completed we would recommend restarting your display when your local pressure is at 29.92 by removing the batteries and unplugging any power for about 2 minutes. Once you put the batteries back in, and power up the display your learning mode should start over.