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Description
This dataset provides Daymet Version 4 data as gridded estimates of daily weather parameters for North America, Hawaii, and Puerto Rico. Daymet variables include the following parameters: minimum temperature, maximum temperature, precipitation, shortwave radiation, vapor pressure, snow water equivalent, and day length. The dataset covers the period from January 1, 1980, to December 31 (or December 30 in leap years) of the most recent full calendar year for the Continental North America and Hawaii spatial regions. Data for Puerto Rico is available starting in 1950. Each subsequent year is processed individually at the close of a calendar year. Daymet variables are provided as individual files, by variable and year, at a 1 km x 1 km spatial resolution and a daily temporal resolution. Areas of Hawaii and Puerto Rico are available as files separate from the continental North America. Data are in a North America Lambert Conformal Conic projection and are distributed in a standardized Climate and Forecast (CF)-compliant netCDF file format.
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Thornton, M. M., Shrestha, R., Wei, Y., Thornton, P. E., & Kao, S.-C. (2020). Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 4 (Version 4). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/1840
Date Accessed: 2026-11-09
@article{Thornton_Shrestha_Wei_Thornton_Kao_2020,
title={Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 4},
url={https://www.earthdata.nasa.gov/data/catalog/ornl-cloud-daymet-daily-v4-1840-4},
DOI={10.3334/ORNLDAAC/1840},
abstractNote={This dataset provides Daymet Version 4 data as gridded estimates of daily weather parameters for North America, Hawaii, and Puerto Rico. Daymet variables include the following parameters: minimum temperature, maximum temperature, precipitation, shortwave radiation, vapor pressure, snow water equivalent, and day length. The dataset covers the period from January 1, 1980, to December 31 (or December 30 in leap years) of the most recent full calendar year for the Continental North America and Hawaii spatial regions. Data for Puerto Rico is available starting in 1950. Each subsequent year is processed individually at the close of a calendar year. Daymet variables are provided as individual files, by variable and year, at a 1 km x 1 km spatial resolution and a daily temporal resolution. Areas of Hawaii and Puerto Rico are available as files separate from the continental North America. Data are in a North America Lambert Conformal Conic projection and are distributed in a standardized Climate and Forecast (CF)-compliant netCDF file format.},
publisher={ORNL Distributed Active Archive Center},
author={Thornton, M.M. and Shrestha, R. and Wei, Y. and Thornton, P.E. and Kao, S-C.},
year={2020},
language={en},
}
Thornton, M.M., R. Shrestha, Y. Wei, P.E. Thornton, and S-C. Kao. “Daymet: Daily Surface Weather Data on a 1-Km Grid for North America, Version 4.” ORNL Distributed Active Archive Center, January 1, 2020. doi:10.3334/ORNLDAAC/1840.
Date Accessed: 2026-11-09
Thornton, M. M., et al. “Daymet: Daily Surface Weather Data on a 1-Km Grid for North America, Version 4.” With ORNL DAAC, Version 4, ORNL Distributed Active Archive Center, 1 Jan. 2020, https://doi.org/10.3334/ORNLDAAC/1840.
Date Accessed: 2026-11-09
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