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"Heating degree days", or "HDD", are a measure of how much (in degrees), and for how long (in days), outside air temperature was lower than a specific "base temperature" (or "balance point"). They are used for calculations relating to the energy consumption required to heat buildings.
Degree days are measures of how cold or warm a location is. A degree day compares the mean (the average of the high and low) outdoor temperatures recorded for a location to a standard temperature, usually 65° Fahrenheit (F) in the United States.
A "degree day" is a unit of measure for recording how hot or how cold it has been over a 24-hour period. The number of degree days applied to any particular day of the week is determined by calculating the mean temperature for the day and then comparing the mean temperature to a base value of 65 degrees F. (The "mean" temperature is calculated ...
A degree day is a measure of heating or cooling. Total degree days from an appropriate starting date are used to plan the planting of crops and management of pests and pest control timing.
There are three main types of degree days: heating degree days (HDD), cooling degree days (CDD), and growing degree days (GDD). I've focused most of this article on explaining heating degree days. Once you understand how heating degree days work, it will be very easy for you to understand the others.
There are three popular methods for approximating degree days from daily temperature data: The first two are both known as the "Mean Temperature Method". They approximate the degree days for each day using the average temperature for the day.
Degree days are the difference between the daily temperature mean, (high temperature plus low temperature divided by two) and 65°F. If the temperature mean is above 65°F, we subtract 65 from the mean and the result is Cooling Degree Days.
Heating degree day (HDD) is a measurement designed to quantify the demand for energy needed to heat a building. HDD is derived from measurements of outside air temperature. The heating requirements for a given building at a specific location are considered to be directly proportional to the number of HDD at that location.
This online calculator pulls weather station data--including heating and cooling degree days (HDD and CDD)--from more than 900 weather stations around the United States and Canada.
A degree day is a vital measurement of outside air temperature with numerous applications, including identifying energy consumption, creating agricultural plans, or tracking environmental changes.