A measure that gauges the amount of heating or cooling needed for a building using 65 degrees as a baseline. Electrical, 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 Cooling Degree Days.
Generally, a measure of the departure of the mean daily temperature from a given standard; one degree day for each degree (°C or °F) of departure above (or below) the standard during one day. Degree days are accumulated over a "season." As used by the U.S. Army Corps of Engineers, degree days are computed above and below 32°F, positive if above and negative if below.
A measure of the departure of the mean daily temperature from a given standard. It can be either above or below the standard for the day. Degree-days are accumulated over a "season" at any point during which the total can be used as an index of past temperature effect upon some quantity, such as plant growth, fuel consumption, power output, etc. Recently, degree-days have been more frequently applied to fuel and power consumption, e.g., heating-degree day and cooling-degree day.
A measure of the coldness of the weather (heating degree day) or the hotness of the weather (cooling degree day). Degree days are calculated as the difference between the daily mean temperature and 65 degrees Fahrenheit.
A degree day is generally defined as the difference between the daily average temperature and a given temperature base. This term was created to better measure demand for energy for heating or cooling purposes.
A unit, based upon temperature difference and time, used in estimating fuel consumption and specifying nominal heating load of a building in winter. For any one day, when the mean temperature is less than 65oF, there exist as many degree days as there are Fahrenheit degrees difference in temperature between the mean temperature for the day and 65oF.
Deviation of one degree temperature for one day from an arbitrary standard, usually the long-term average temperature for a place.
the day on which university degrees are conferred
a unit used in estimating fuel requirements for heating a building
a measure of how much heating is needed in a particular day
a measure of relative heating and cooling energy required by buildings
a measure of temperature variation from standard, used primarily in connection with heating and cooling loads
a quantitative index which reflects demand for energy to heat or cool houses and businesses or grow crops
a unit based on accumulated heat to measure physiological time
a unit of measure reported by the National Weather Service that provides us with the most accurate way of forecasting your heating consumption
A unit used in the measurement of the duration of a life cycle or a particular growth phase of an organisim (e.g. egg development);calculated as the product of time and temperature average over a specific interval.
It is measurement of the departure of the daily temperature above the minimum threshold temperature for a crop or plant.
A quantitative index that reflects demand for energy to heat or cool homes and businesses. A mean daily temperature of 65°F is the base for both heating and cooling degree day computations. Heating degree days are summations of negative differences between the mean daily temperature and the 65°F base; cooling degree days are summations of positive differences from the same base.
a measure of the departure of the daily mean temperature from the normal daily temperature; heating and cooling Degree Days are the departure of the daily mean temperature from sixty-five degrees Fahrenheit.
A measure of departure from the mean daily temperature. One degree day occurs when the daily mean temperature is above or below 65 degrees Fahrenheit.
A measure of the cold weather based on the extent to which the daily average temperature falls below a reference temperature, usually 65 degrees Fahrenheit.
a measure of the difference between the mean daily temperature and some given base temperature: one degree day is given for each degree (degree Celsius or degree Fahrenheit) of departure above (or below) the base temperature during one day
Term created to better forecast demand for energy. Number of degree days is calculated from the difference between actual temperature and a previously set level (usually 65 degrees). Expressed in Cooling Degree Days or Heating Degree Days
A measure of the departure of the mean daily temperature above or below a given standard. A ten-degree difference for one day equals ten degree days, as does a one-degree difference for ten days.
A unit of temperature. Experience has shown that, for buildings requiring an inside temperature of approximately 70°F, the amount of fuel or heat used per day is proportional to the number of degrees the average outside temperature falls below 65°F. The degree-day is based upon this principle. The number of degree-day (65°F base) for a given period is the difference between 65°F and the United States Weather Bureau daily mean temperature, when the latter is less than 65°F, multiplied by the number of days.
The number of degrees that the mean temperature for that day is below 65° F. (eg. mean temp. of 40° F for the day--65-40=25 degree days)
A unit of measure expressed as Heating Degree Days (HDD) and/or Cooling Degree Days (CDD). Derived from the variance between the average temperature during a given time period (month, season, year) and a reference point, usually 65 degrees Fahrenheit.
A unit, based upon temperature difference and time, used in estimating fuel consumption and specifying nominal annual heating and cooling loads of a building. When the mean temperature is less than 65 degrees Fahrenheit, the heating degree days are equal to the total number of hours that temperature is less than 65 degrees Fahrenheit for an entire year.
extent to which average daily temperature exceeds/falls below 65 Deg F
A unit that represents a 1 degree F. deviation from some fixed reference point (usually 65°F.) in the mean daily outdoor temperature.
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 called Cooling Degree Days because they are days when people are likely to use energy for air conditioning. Heating Degree Days refer to days when people are likely to use energy for heating.
Unit that represents one degree of difference from inside temperature and the average outdoor temperature for one day and is often used in estimating fuel requirements for a building.
A measure 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.
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, see Cooling Degree Day) an assumed base temperature, normally taken as 65 degrees Fahrenheit, unless otherwise stated. One degree day is counted for each degree below (for heating) or above (in the case of cooling) the base, for each calendar day on which the temperature goes below or above the base.
A degree day is a measure of heating or cooling. Totalised degree days from an appropriate starting date are used to plan the planting of crops and management of pests. Weekly or monthly degree-day figures may also be used within an energy monitoring and targeting scheme to monitor the heating and cooling costs of climate controlled buildings, while annual figures can be used for estimating future costs.