Heating degree days are summations of negative differences between the mean daily temperature and the 18 °C base; cooling degree days are summations of positive differences from the same base.
**Heating Degree Days**
A heating degree day is the departure of one degree per day in the mean daily temperture from a standard reference temperature of usually 65 degrees F.
HEATING DEGREE DAY
One heating degree day is given for each degree that the daily mean temperature is below 65°F. It is used as an indication of fuel consumption.
Heating Degree Days
(abbrev. HDD) A form of degree day used to estimate energy requirements for heating. Typically, heating degree days are calculated as how much colder the mean temperature at a location is than 65?Ǭ?F on a given day.
Heating Degree Day see Degree Day.
Heat Index The Heat Index (HI) or the "Apparent Temperature" is an accurate measure of how hot it really feels when the Relative Humidity (RH) is added to the actual air temperature.
heating degree day: a measurement used to determine how much fuel will be needed to heat indoor environments. There is one heating degree-day unit for each degree that the mean daily temperature departs from 65 °F or 18 °C.
HEATING DEGREE DAY
One heating degree day is given for each degree that the daily mean temperature is below 65¡F. It is used as an indication of fuel consumption.
Related terms: degree day or cooling degree day ...
Heating Degree Day - A form of degree day used to estimate the required energy for heating. One heating degree day occurs for each degree the daily mean temperature is below 65 degrees Fahrenheit.
Heating Degree Day (HDD)- useful in determining heating energy requirements. Defined as (65 - MT)= HDD,where MT is Mean Temperature (F). If MT is greater than 65 degrees F, HDD=0. MT= Mean (average)Temperature of the day.
For more specific definitions and how to calculate degree days, see the definitions for Heating Degree Days and Cooling Degree Days.
If the difference is negative, it is called a "Heating Degree Days". The magnitude of the difference is the number of days.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: CDD, Composite, Cooling Degree Days, Degree Day, Growing Degree Day, HDD, Heating Degree Days
Also listed in ...
of the departure of the mean daily temperature from a given standard. That is one degree day for each degree (Fahrenheit or Celsius) of departure above or below the standard during one day. Related terms: cooling degree day and heating degree day ...
natural gas, power, and heating, and air conditioning industries utilize heating and cooling degree information to calculate their needs. For more specific definitions and how to calculate degree days, see the definitions for Heating Degree Days and ...
 See also: Weather, Degree, Temperature, Degree day, Thunderstorm
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