degree day

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 cooling is needed. The number of degree days recorded on a given date is equal to the difference between 65 and the mean temperature for that date (figured as the average of the highest and lowest temperatures). If the mean temperature is above 65, cooling degree days (CDD) are recorded; if it is below 65, heating degree days (HDD) are recorded. The total number of heating or cooling degree days recorded in any period of time measures rather accurately the demand during that time for fuel used in heating and cooling buildings.

Dictionary of units of measurement. 2015.

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  • degree-day — [di grē′dā΄] n. a unit which represents one degree of variation from a standard average daily temperature, used as in determining fuel requirements …   English World dictionary

  • Degree day — A degree day is a measure of heating or cooling. Totalized degree days from an appropriate starting date are used to plan the planting of crops and management of pests and pest control timing. Weekly or monthly degree day figures may also be used …   Wikipedia

  • degree-day —  ̷ ̷ˈ ̷ ̷| ̷ ̷ noun : a unit that represents one degree of declination from a given point (as 65°) in the mean outdoor temperature of one day and is often used in measuring fuel requirements of buildings * * * /di gree day /, n. Engin. one degree …   Useful english dictionary

  • Degree Day —   A unit for measuring the extent that the outdoor daily average temperature (the mean of the maximum and minimum daily dry bulb temperatures) falls below (in the case of heating, see Heating Degree Day), or falls above (in the case of cooling,… …   Energy terms

  • degree-day — /di gree day /, n. Engin. one degree of departure, on a single day, of the daily mean temperature from a given standard temperature. Abbr.: dd Also, degree day. Cf. cooling degree day, growing degree day, heating degree day. [1925 1930] * * * …   Universalium

  • degree day — Term created to assess and acknowledge expected demand for energy. A degree day value is the difference between a day s average temperature and a previously set temperature ( in the U.S., 65 degrees Fahrenheit). Degree days above 65 degrees are… …   Financial and business terms

  • degree-day — de•gree day [[t]dɪˈgriˌdeɪ[/t]] n. mer one degree of departure, on a single day, of the daily mean temperature from a given standard temperature …   From formal English to slang

  • degree day — see day degree …   Dictionary of ichthyology

  • degree-day — Unit that represents one degree of difference from inside temperature and the average outdoor temperature for one day; often used in estimating fuel requirements for a building …   Dictionary of automotive terms

  • degree day — noun 1. the day on which university degrees are conferred • Syn: ↑commencement day • Hypernyms: ↑day 2. a unit used in estimating fuel requirements for heating a building • Hypernyms: ↑temperature unit …   Useful english dictionary

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