heating degree day (HDD)

heating degree day (HDD)
A day in which the average daily temperature is less than 65 degrees Fahrenheit, and therefore likely to be a day in which people turn on their heat. A heating degree day is assigned a value that represents the number of degrees that days average temperature is less than 65 degrees. For example, if a day's average temperature is 45 degrees, the Heating Degree Day (HDD) value for that day would be 20 (65 45). If the average temperature is greater than or equal to 65 degrees, the HDD value for the day would be zero. (The day would not be sufficiently cold to require heating.)

Financial and business terms. 2012.

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  • Heating Degree Day - HDD — The number of degrees that a day s average temperature is below 65o Fahrenheit (18o Celsius), the temperature below which buildings need to be heated. The price of weather derivatives traded in the winter is based on an index made up of monthly… …   Investment dictionary

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  • Heating Degree Days — (HDD)   A measure of how cold a location is over a period of time relative to a base temperature, most commonly specified as 65 degrees Fahrenheit. The measure is computed for each day by subtracting the average of the day s high and low… …   Energy terms

  • degree day — (deg da)    a unit used in meteorology and engineering to measure the demand for heating or cooling. In the United States, it s agreed that 65 °F (18.3 °C) is the critical outside temperature; below this tempeature heating is needed and above it… …   Dictionary of units of measurement

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  • HDD — may refer to:*Hard disk drive, a computer device which stores digitally encoded data *Heating degree day, quantitative indices designed to reflect the demand for energy *High definition display, in reference to high definition video, high… …   Wikipedia

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  • List of meteorology topics — This is a list of meteorology topics. The terms relate to meteorology, the interdisciplinary scientific study of the atmosphere that focuses on weather processes and forecasting. (see also: List of meteorological phenomena)AlphanumericTOC… …   Wikipedia

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