TH] =
heating degree days (HDD) (Thom 1954; Quayle and Diaz 1979)
Initial results for cycling and gas consumption are shown in Figure 1, in which the weekly gas consumption (therms) and cycles are shown adjusted for local
heating degree days (Base 65[degrees]F/18[degrees]C).
i] are monthly
heating degree days and cooling degree days respectively for region i where regions are defined as the area served by a particular power distribution company, in this case, KESC, [T.
Riker says the company already has created more than 500 customized indexes for five industries, based on weather correlations over specific time periods to benchmarks such as
heating degree days.
Currently, New York is at 68% of normal
heating degree days.
The four climate zones, roughly following lalitudinal lines across the United States, conform to traditional climate classifications by building codes and programs, such as Building America, and rely on a combined use of cooling and
heating degree days to accommodate humidity--and even consider conditions such as passive shading and building orientation.
j] is the average number of
heating degree days in area j per year; [CDD.
The Merc offers monthly contracts based on
heating degree days expected in those cities.
the economist who calculated health care outlays, made no estimate of the costs or savings should the climate warm; but his numbers show that for every 5% reduction in the annual number of
heating degree days, a measure of winter's chill, health care costs would fall by $0.
i~ is the surface area i in square feet; HDD is number of
heating degree days, a measure of T over a year; and 24 is number of hours in a day.
Heating degree days (HDD) refer to the difference (in degrees F[degrees]0 between the daily average outdoor temperature and a base temperature (usually 65[degrees]F).
Of greater concern to electric and natural gas utilities, this past winter also ranked number three in terms of fewest
heating degree days.
