Weather Forecaster Temperature and Humidity with illuminated color display measures indoor/outdoor temperature, indoor humidity and barometric pressure. 3 light settings high, medium or low. Auto dim mode automatically adjusts display brightness based on time of day. This weather forecaster gives you a glimpse of possible future conditions by using patented Self-Calibrating Technology to provide you with a personal weather forecast. Programmable alarms sound an alert to notify you when a temperature or humidity value has been reached or exceeded.