Įach building in the CBECS is assigned a CBECS climate zone based on the 30-year average (1971-2000) HDD and CDD (base 65 degrees Fahrenheit) for the NOAA climate division in which the weather station closest to the sampled building is located. For individual state maps that show the NOAA climate divisions by county, see. For a map of all the NOAA climate divisions in the U.S., see. Boundaries of these divisions generally coincide with county boundaries, except in the western U.S., where they are based largely on drainage basins. There are 359 NOAA climate divisions within the 50 U.S. Cooling degree-days for a year are the sum of the daily cooling degree-days for that year. For example, if the average temperature for a given day is 80 degrees, then the cooling degree-days for that single day equal 15. The cooling degree-day is the difference between that day's average temperature and 65 degrees if the daily average is greater than 65 it is zero if the daily average temperature is less than or equal to 65. Similarly, a CDD is a measure of how hot a location was over a period of time, relative to a base temperature (65 degrees Fahrenheit). Heating degree-days for a year are the sum of the daily heating degree-days that year. For example, if the average temperature for a given day is 40 degrees, then the heating degree-days for that single day equal 25. The heating degree-day is the difference between that day's average temperature and 65 degrees if the daily average is less than 65 it is zero if the daily average temperature is greater than or equal to 65. All previous CBECS used averages for the 45-year period from 1931 through 1975.)Ī HDD is a measure of how cold a location was over a period of time, relative to a base temperature (in CBECS, 65 degrees Fahrenheit). (These climate zones have been updated for the 2003 CBECS. Each NOAA climate division is placed into one of five CBECS climate zones based on its 30-year average heating degree-days (HDD) and cooling degree-days (CDD) for the period 1971 through 2000.
The CBECS climate zones are groups of climate divisions, as defined by the National Oceanic and Atmospheric Administration (NOAA), which are regions within a state that are as climatically homogeneous as possible.
EERE’s Guide to Determining Climate Regions by County contains a list of all U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE).
The 2012 CBECS is no longer using the historical HDD- and CDD-based climate zones as in previous survey cycles and is instead using climate regions created by the Building America program, sponsored by the U.S. Building America Climate Regions - CBECS 2012
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