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 av [..]

(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°F on [..]

According to 10 CFR 440.3 [Title 10 Energy; Chapter II Department of Energy; Subchapter D Energy Conservation; Part 440 Weatherization Assistance for Low-Income Persons], the term Heating Degree Days [..]

The number of degrees that a daily average temperature is below a base temperature (typically 65°), summed up daily for an entire year. The heating degree days for a certain climate or locations can be used to estimate how much energy will be needed to keep a space warm.

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 [..]

A weather measurement used to estimate the energy requirement for heating a home. Heating degree days are calculated as how much colder the average daily temperature is than 65 degrees F., the outdoor [..]

(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°F on a given day. For example, if a location experiences a mean temperature of 55°F on a certain day, there were 10 HDD (Heating Degree Days) that day bec [..]

  A value reflecting the amount of energy needed to heat a building. Annual Heating Degree Days (HDD) is the total HDD in a year based on 30-year averages for specific climate regions. Example: The am [..]

A measure used to assess weather’s impact on natural gas usage. Each degree (°F) by which the average temperature falls below 65°F represents one HDD (i.e. a day with average temperature of 45°F would have 20 HDDs).

Heating Degree Days is the cumulative number of degrees in a month or year by which the mean temperature falls below 18.3°C (the threshold set at Pickering Weather). To calculate the Heating Degree Days for a particular day, find the day's average temperature by adding the day's high and low temperatures and dividing by two. If the number [..]

(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 [..]