Plan your day with confidence. The high-precision 5-in-1 weather sensor accurately measures five different conditions, including rainfall, wind speed and wind direction, outdoor temperature and humidity, giving you comprehensive data about the elements surrounding your home. AcuRite's 5-in-1 sensor-based weather station tracks specific sets of weather related variables, including changes in temperature, humidity, and barometric pressure to generate a forecast with pinpoint accuracy personalized for your location. Its patented self-calibrating weather forecasters use a unique algorithm to analyze changes in pressure and temperature over 14 days to determine your altitude. Measuring changes in barometric pressure adjusted for your location's altitude is a proven method for determining the future weather forecast. Self-Calibrating Forecasting Technology makes AcuRite weather stations simple to install and extremely accurate. The sensor itself is wireless, simple to install and works down to -40 degrees.