What are degree days?

Heating degree day (HDD) are quantitative indices designed to reflect the demand for energy needed to heat a building. These indices are derived from daily temperature observations. The heating requirements for a given building are considered to be directly proportional to the number of HDD at that location. A similar index, cooling degree day' (CDD), reflects the amount of energy used to cool a building.

Degree day data is required to isolate and discount the effects of outside temperature on your business’s energy use. Allowing you to focus on what is important.

SMEasure imports the weekly HDD for 77 weather stations around the country. In the building tab you will find a table listing the number of heating "degree days" for each week of energy monitoring. The greater the number the greater the integral between the building base temperature and the outside temperature.

We make available historical and present HDD and CDD for each of these weather stations. You can download this data from us.