American Heritage® Dictionary of the English Language, Fourth Edition
- n. A unit of measurement equal to a difference of one degree between the mean outdoor temperature on a certain day and a reference temperature, used in estimating the energy needs for heating or cooling a building.
- n. Alternative form of degree day.
“With regard to air temperature, combined regional data from the mid-1970s onward show relatively small magnitude, positive trends in thawing degree-day totals, and a rise in mean annual air temperature.”
“Annual heating degree-day totals characterize the demand for heating over the entire cold period.”
“As climate change effects become more pronounced (e.g., degree-day boundaries or mean temperature isotherms shift northward), the more ecologically vagile species are likely to extend their geographic ranges northward .”
“Growing degree-day requirements for various crops from the highest-latitude areas possible were obtained from the literature, and similar GDD requirements were assumed for a given crop throughout the region.”
“Growing degree-day analysis When GDD0 was used for analysis, all of the ACIA-designated models projected that all the examined locations would be suitable for green pea production early in this century, and the high-extreme models (GFDLR30_ c and CGCM2) projected climates suitable for barley at all locations by 2030.”
“Growing degree-day requirements for various annual crops to reach maturity  and for forage crops to reach optimum harvest stage .”
“As I have been known to opine before, "A degree-day saved is a degree-day earned.”
“Well, as Poor Richard always used to say, "A degree-day saved is a degree-day earned.”
“In 14% of the documented responses, the plant trait was correlated with thawing degree-day totals from snowmelt TDDsm, and temperature was considered the dominant factor.”
“Well, as Wife is wont to say, a degree-day saved is a degree-day earned.”
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