This datasource includes a map of accumulated growing degree days over the entire year, globally. Growing degree days are calculated as the number of hours during a period of time where the temperature is above 10C and below 30C. Data were taken from 'ERA5 hourly data on single levels from 1940 to present', which has a 0.25 x 0.25 degree (~25km x 25km) resolution. Data were then resampled to a 10x10km resolution using a Bilinear resampling method to increase usability and granularity. Growing degree days is calculated by taking the mean daily temperature, and subtracting a base temperature. This dataset uses a base temperature of 5C.
A public project on the Demeter platform. Pan, zoom and inspect the dataset — no account needed.
Live values from Ma'rib across the annual layers published for this domain.
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One downloadable layer per year.
Mean across the full covered period.
Dry-year benchmark across the covered period.
Wet-year benchmark across the covered period.
Inter-annual variability across the covered period.
Longer history, additional frequencies and regional workflows are available through Demeter.
Selected Demeter indices that reference this dataset family.
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Demeter’s growing degree days data covers Global, 2015–2024. Coverage can be inspected directly in the map viewer on this page, and a wider range of data on growing degree days is available in the downloads section above. Longer history and wider coverage are available through the Demeter platform.
Downloads from this page are provided as the formats shown in the downloads section on this page. Every Demeter dataset is built to be legible to AI, so the quickest way to inspect one is to open it with Claude, ChatGPT or another AI platform. Datasets with a map component also open in GIS software, including the free open-source QGIS as well as ArcGIS. Numerical and tabular data is provided in Microsoft Excel-compatible formats such as XLSX and CSV.
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Demeter updates growing degree days data as new source data is published. The period currently published on this page is 2015–2024. Higher-frequency series, longer history and release notifications are available through the Demeter platform.
Demeter’s datasets are compiled from a wide range of proprietary, public and third-party sources. Where a Demeter dataset incorporates third-party data without substantial additional processing, that source is prominently attributed in the dataset description.
Yes. All Demeter data is standardised onto a common taxonomy, so growing degree days can be compared and combined directly with every other Demeter dataset, across regions and across domains. The same conventions apply wherever you use the data — on this page, on the Demeter platform and through the Demeter MCP server.
Downloads from this page are made available free of charge, subject to appropriate citation. The Demeter platform provides access to all Demeter data across every domain in our coverage universe, and is primarily intended for institutional, corporate and large independent users. Access to our full data coverage is available via subscription and one-time purchases. Please enquire at [email protected] for more details.
When incorporating data from Demeter into your work or materials, please attribute us as Demeter, Demeter Data or demeterdata.ag. In charts, articles and model outputs, “Source: Demeter” with a link to this page is sufficient. For a formal reference, cite: Demeter (2015–2024) Growing Degree Days. https://demeterdata.ag/resources/domain/growing_degree_days.
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