I know that a Cooling Degree Day is a day in which people should turn of the air conditioning. I think a Heating Degree Day is something similar.Can someone clearly define Heating Degree Days and Cooling Degree Days?
It's used for conserving energy: http://www.erh.noaa.gov/cle/climate/inf ... edays.html <this website explains it better than I can.Could you elaborate on that?
Here is an explanation of degree days.
From a meteorological standpoint, degree days are defined with respect to 65 F as a reference point. The National Weather Service calculates it as follows:
The daily high and low temperature, both measured to the nearest whole degree Fahrenheit, are averaged. If the average is not an integer, it is rounded up. Subtract this average from 65. If it is a positive quantity, it is the number of COOLING degree days for that day. If it is negative, its absolute value is the number of HEATING degree days.
As an example, yesterday in Omaha, Nebraska the high was 55 and the low 28. Averaging those two numbers:
Average = (High + Low)/2 = (55 + 28)/2 = 83/2 = 41.5. We need to round this up to 42 (it is always rounded up).
Degree Days = Average - 65 = 42 - 65 = -23. It's negative so yesterday there were 23 HEATING degree days in Omaha.
Degree days are reported daily in climate summaries issued by the National Weather Service. Monthly and yearly sums of the daily degree days are also reported. Counts for heating and cooling degree days are kept separate.
Note: the "year" for heating degree days is typically that sum from the period July 1-June 30, while cooling runs from January 1-December 31.
Degree days can be calculated with other reference values than 65, but the National Weather Service standard is 65 degrees.
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