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Daymet Version 4 Daily Data Now Produced Monthly

Submitted by ORNL DAAC Staff on 2021-06-13
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Daymet V4 maximum daily temperature shown for March 31, 2021.
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Daymet V4 maximum daily temperature shown for March 31, 2021.

The ORNL DAAC recently released the following Dayment dataset by Thornton, M.M., et al. (2021):

Daymet Version 4 Monthly Latency: Daily Surface Weather Data

This dataset provides Daymet Version 4 daily data on a monthly release cycle as 1-km gridded estimates of daily weather variables for minimum and maximum temperature, precipitation, shortwave radiation, vapor pressure, snow water equivalent, and day length. Data are derived from the recently released Daymet version 4 software which includes several improvements from a previous version including reductions in the timing bias of input reporting weather station measurements; improvement to the three-dimensional regression model techniques in the core algorithm; and a novel approach to handling high elevation temperature measurement biases. Data are available for the Continental North America in a Lambert Conformal Conic projection and are distributed in a standardized Climate and Forecast (CF)-compliant netCDF file format.

These provisional data are based on daily weather station data inputs that are not considered “archive” quality.

Data derived monthly are available by direct download from the ORNL DAAC Daymet Project Page

Daymet provides long-term, continuous, gridded estimates of daily weather by interpolating and extrapolating ground-based observations through statistical modeling techniques. The Daymet data products provide driver data for biogeochemical terrestrial modeling and have myriad applications in many Earth science, natural resource, biodiversity, and agricultural research areas. Daymet weather variables include daily minimum and maximum temperature, precipitation, vapor pressure, shortwave radiation, snow water equivalent, and day length produced on a 1 km x 1 km gridded surface over continental North America and Hawaii from 1980 and over Puerto Rico from 1950 through the end of the most recent full calendar year.  

Access to all local delivery methods for the the Daymet V4 Daily data is available from the Daymet Project Website's Get Data Page


Thornton, M.M., R. Shrestha, P.E. Thornton, S. Kao, Y. Wei, and B.E. Wilson. 2021. Daymet Version 4 Monthly Latency: Daily Surface Weather Data. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1904

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