Average weather calculator12/7/2023 T BASE = Cooling Degree Day base temperature, usually 65 The Cooling Degree Days would then be 80 - 65 = 15 CDD.ĬDD = T MEAN – T BASE, if T MEAN is greater than T BASE For example, if the high temperature for the day was 92☏ and the low was 68☏, the mean temperature for the day would be 92 + 68 = 160 / 2 = 80☏. If the mean temperature is above 65☏, the CDD amount is the difference between the mean temperature and 65. When the mean temperature is below 65☏, the CDD total is zero. The daily mean temperature is found by adding together the high and low temperature for the day and dividing by two. By monitoring air conditioner energy usage and cooling degree day accumulation over a period of time, a building's energy consumption per CDD can be calculated and this value used, for example, in energy use monitoring, energy efficiency evaluation or future energy usage estimates. When the mean temperature rises above 65☏, many buildings use air conditioning to maintain a comfortable indoor temperature. T MEAN = mean temperature, (T MAX + T MIN)/2Ĭooling Degree Days (CDD) is an index used to estimate the amount of energy required for cooling during the warm season. T BASE = Heating Degree Day base temperature, usually 65 HDD = 0, if T MEAN is greater than T BASE HDD = T BASE – T MEAN, if T MEAN is less than T BASE The Heating Degree Day total would then be 65 - 60 = 5 HDD. For example, if the high temperature for the day was 68☏ and the low 52☏, the mean temperature for the day would be 68 + 52 = 120 / 2 = 60☏. If the mean temperature is below 65☏, the HDD amount is the difference between 65☏ and the mean temperature. When the mean temperature is above 65☏, the HDD total is zero. By monitoring heating fuel usage and heating degree day accumulation over a period of time, a building's energy consumption per HDD can be calculated and this value used, for example, in fuel consumption monitoring, energy efficiency evaluation or future fuel supply estimates. When the daily mean temperature falls below 65☏, most buildings require heat to maintain a comfortable interior temperature. ![]() Heating Degree Days (HDD) is an index used to estimate the amount of energy required for heating during the cool season.
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