• Attention! The time on the page is local time (not including daylight saving time). To obtain Universal Time, subtract the correction, equals -5 h. Current weather data received from the weather station Washington-Dulles International Airport (Virginia, USA).
• Location of the weather station:
  latitude 38.9347 longitude -77.4475 altitude 95 m.
• Effective temperature - the temperature felt by a seasonally dressed person in the shade. The calculation takes into account the influence of humidity, wind speed and atmospheric pressure on the human heat perception.
• Effective sun temperature - the temperature that a person feels, adjusted for solar radiation. Depends on the height of the sun above the horizon. At night and in cloudy weather, the correction is zero.
• A symbolic image of an atmospheric phenomenon is shown in the upper left corner.
• In the upper right corner you can see the comfort of the weather during the observation period.