*********************** Degree Day Calculations *********************** There are five types of degree day calculations represented in the Point Forecast API. (These are assuming usage of degrees Fahrenheit.) **CDD1** Cooling degree days. This is the standard method of subtracting 65 using the average of the daily high temperature and daily low temperature. .. code-block:: xml CDD1 = (Daily High Temp + Daily Low Temp) / 2.0 – 65 **CDD2** Cooling Degree Days (Experimental). This method subtracts the 65 from the average of all of the 24 hourly temperatures. .. code-block:: xml CDD2 = Average Temp for the Day – 65 **HDD1** Heating degree days. This is the standard method that subtracts the average of the high and low temperature from 65. .. code-block:: xml HDD1 = 65 - ((Daily High Temp + Daily Low Temp) / 2.0) **HDD2** Heating Degree Days (Experimental). This method subtracts the average of all 24 hours from 65. .. code-block:: xml HDD2 = 65 – Average Temp for the Day **GDD** Growing Degree Days - This is the standard method of taking the average high and low temperature and subtracting a reference temperature. For this product, it uses the common value of 50. .. code-block:: xml GDD = (Daily High Temp + Daily Low Temp) / 2.0 – 50