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A degree day is a measure of heating or cooling based on the temperature difference from a base value. Learn how degree days are computed, used for energy monitoring, plant growth and pest control, and standardized in different regions.
Degree-days measure how cold or warm a location is compared to a standard temperature, usually 65°F. Learn how to calculate heating degree days (HDDs) and cooling degree days (CDDs), and find historical and forecast data for the U.S. and its regions.
Learn how to calculate and interpret degree days, a unit of measure for recording how hot or how cold it has been over a 24-hour period. Find monthly totals for previous months and degree day information for Atlanta, Athens, Columbus and Macon.
Learn how to calculate degree days based on the difference between the daily temperature mean and 65°F. Find out how to use degree days for tracking energy use and compare months and seasons.
Degree days are a measure of how much and how long the outside air temperature is below a certain level, used to estimate building energy consumption. Learn how degree days are calculated, used, and approximated for heating, cooling, and growing purposes.
That’s where heating degree days and, to a lesser extent, cooling degree days come in. What is a degree day? A degree day is a combination of time and temperature difference (ΔT). The basic idea behind it is to give you an indication of how much heating or cooling a building might need. Emphasis on the “might” there.
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.
"Cooling degree days", or "CDD", are a measure of how much (in degrees), and for how long (in days), outside air temperature was higher than a specific base temperature. They are used for calculations relating to the energy consumption required to cool buildings. Degree days also have applications relating to plant growth ("growing degree days ...
What is a Degree Day? Looking it up in the AccuWeather Glossary yields this definition: Generally, a measure of the departure of the mean daily temperature from a given standard, one degree...
The higher the cooling degree days, the hotter the region is. For heating degree days, the calculation is the opposite: subtract the average temperature of the day from 65°F. For example, if a winter day has an average temperature of 30°F, that day has 35 heating degree days (65°F - 30°F = 35).