Daymet V4: Daily Surface Weather and Climatological Summaries

  • Daymet V4 provides daily gridded estimates of weather parameters (e.g., precipitation, temperature, radiation) for North America, Hawaii, and Puerto Rico from 1980 to 2023 (Puerto Rico data starts in 1950).

  • The dataset includes daily minimum and maximum temperature, precipitation, shortwave radiation, snow water equivalent, vapor pressure, and daylight duration.

  • Daymet V4 is available at a 1km spatial resolution and is based on meteorological station data and various supporting sources, offering improvements over previous versions in addressing biases.

  • This dataset is in the public domain and freely accessible for use and distribution.

  • The dataset is provided by NASA ORNL DAAC and can be accessed and analyzed using Google Earth Engine.
NASA/ORNL/DAYMET_V4
Dataset Availability
1980-01-01T00:00:00Z–2024-12-30T00:00:00Z
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NASA/ORNL/DAYMET_V4")
Cadence
1 Day
Tags
climate daily daylight flux geophysical nasa ornl precipitation radiation snow temperature vapor water weather
daymet

Description

Daymet V4 provides gridded estimates of daily weather parameters for Continental North America, Hawaii, and Puerto Rico (Data for Puerto Rico is available starting in 1950). It is derived from selected meteorological station data and various supporting data sources.

Compared to the previous version, Daymet V4 provides effective solutions to known issues and further considers improvements to what were believed to be input weather station biases. Improvements include:

  • Reductions in the timing bias of input reporting weather station measurements.

  • Improvement to the three-dimensional regression model techniques in the core algorithm.

  • A novel approach to handling high elevation temperature measurement biases.

2020 and 2021 data are ingested from V4 R1 sources

Documentation:

Bands

Pixel Size
1000 meters

Bands

Name Units Min Max Pixel Size Description
dayl seconds 0* 86400* meters

Duration of the daylight period. Based on the period of the day during which the sun is above a hypothetical flat horizon.
prcp mm 0* 544* meters

Daily total precipitation, sum of all forms converted to water-equivalent.
srad W/m^2 0* 1051* meters

Incident shortwave radiation flux density, taken as an average over the daylight period of the day.
swe kg/m^2 0* 13931* meters

Snow water equivalent, the amount of water contained within the snowpack.
tmax °C -60* 60* meters

Daily maximum 2-meter air temperature.
tmin °C -60* 42* meters

Daily minimum 2-meter air temperature.
vp Pa 0* 8230* meters

Daily average partial pressure of water vapor.
* estimated min or max value

Terms of Use

Terms of Use

This dataset is in the public domain and is available without restriction on use and distribution. See NASA's Earth Science Data & Information Policy for additional information.

Citations

Citations:

  • Thornton, M.M., R. Shrestha, Y. Wei, P.E. Thornton, S-C. Kao, and B.E. Wilson. 2022. Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 4 R1. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2129

  • Other Citation Details - Thornton, M.M., R. Shrestha, Y. Wei, P.E. Thornton, S. Kao, and B.E. Wilson. 2020. Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 4. ORNL DAAC, Oak Ridge, Tennessee, USA. doi:10.3334/ORNLDAAC/1840

DOIs

Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.ImageCollection('NASA/ORNL/DAYMET_V4')
                  .filter(ee.Filter.date('2017-04-01', '2017-04-30'));
var maximumTemperature = dataset.select('tmax');
var maximumTemperatureVis = {
  min: -40.0,
  max: 30.0,
  palette: ['1621A2', 'white', 'cyan', 'green', 'yellow', 'orange', 'red'],
};
Map.setCenter(-110.21, 35.1, 4);
Map.addLayer(maximumTemperature, maximumTemperatureVis, 'Maximum Temperature');
Open in Code Editor
Daymet V4 provides gridded estimates of daily weather parameters for Continental North America, Hawaii, and Puerto Rico (Data for Puerto Rico is available starting in 1950). It is derived from selected meteorological station data and various supporting data sources. Compared to the previous version, Daymet V4 provides effective solutions to …
NASA/ORNL/DAYMET_V4, climate,daily,daylight,flux,geophysical,nasa,ornl,precipitation,radiation,snow,temperature,vapor,water,weather
1980-01-01T00:00:00Z/2024-12-30T00:00:00Z
1.6 -150.8 84 -1.1
Google Earth Engine