Mistry, Malcolm Noshir (2019): A high-resolution (0.25 degree) historical global gridded dataset of monthly and annual cooling and heating degree-days (1970-2018) based on GLDAS data. PANGAEA, https://doi.org/10.1594/PANGAEA.903123, Supplement to: Mistry, MN (2019): Historical global gridded degree‐days: A high‐spatial resolution database of CDD and HDD. Geoscience Data Journal, https://doi.org/10.1002/gdj3.83
Always quote above citation when using data! You can download the citation in several formats below.
Monthly and Annual Cooling/Heating degree-days (CDD/HDD) using daily average temperature (°C), and Cooling degree-days using daily average wet-bulb temperature (Twb), based on the following threshold (base) temperatures:
CDD, CDDwb: 18, 18.3, 22, 23, 24 and 25 (°C)
HDD: 10, 15, 15.5, 16, 17 and 18 (°C)
The degree-days are computed using meteorological parameters from the Global Land Data Acquisation System (GLDAS) ver. 2 (@ 0.25 degree global gridded resolution). The dataset referred to as "DegDays_0p25_1970_2018" covers 49 years over the period 1970-2018.
Units: Degree-Celsius Days. In order to convert to Degree-Fahrenheit Days, multiply by 1.8. e.g. CDD (°F) = 9/5* CDD (°C)
Data files are compressed in tar.bz2 folder containing the individual NetCDF-4 (.nc4) and GeoTIFF (.tif). The files follow the naming convention 'gldas_0p25_deg_DD_base_T_degC_1970_2018_timescale.nc4'; wherein “DD” is the abbreviation of the index (CDD, CDDwb or HDD), degC is the threshold temperature used in the computation of Tb, and “timescale” either “ann” or “mon” relating to annual or monthly timescales over which the corresponding degree-days are computed. Grid-cells with missing values are identified by “1.e+20f”.
Important: GLDAS ver-2 comprises of two sub-versions (ver. 2.0 for period 1970-2010 and ver 2.1 for period 2000-present day). The degree-days computed using the input temperature and variables may show a break in time-series at a few locations around the years 2010-11. Users are therefore advised caution when using the data for trend analysis for instance. Further details on the merging of the two versions can be found below:
24 data points