In large cities such as Chicago, there is a weather data measuring station located midtown besides it's local airports O'Hare (20 miles west) and Midway (15 miles southwest). There can be a considerable difference between the weather conditions in the city and the airport which is located in a flat open area with few buildings around it. Most cities have just the one weather station at the airport. All airports have a weather station since this information is required by arriving and departing airplanes. This is usually the nearest airport to the location. Locations have to be associated and identified by the nearest weather measuring station. Location: Locations are established by latitude, longitude and elevation. It consists of temperature (dry-bulb, wet-bulb and dew-point), barometric pressure, wind speed and direction, humidity, cloud cover and precipitation (amount of rain and snow) Weather is the condition of the atmosphere at a specific location at a certain time.
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