![NASA/ORNL/DAYMET_V4](https://developers.google.com/earth-engine/datasets/images/NASA/NASA_ORNL_DAYMET_V4_sample.png) Dataset Availability : 1980-01-01T00:00:00Z--2025-12-31T00:00:00Z Dataset Producer : [NASA ORNL DAAC at Oak Ridge National Laboratory](https://doi.org/10.3334/ORNLDAAC/1840) Cadence : 1 Day Tags : [climate](https://developers.google.com/earth-engine/datasets/tags/climate) [daily](https://developers.google.com/earth-engine/datasets/tags/daily) [daylight](https://developers.google.com/earth-engine/datasets/tags/daylight) [flux](https://developers.google.com/earth-engine/datasets/tags/flux) [geophysical](https://developers.google.com/earth-engine/datasets/tags/geophysical) [nasa](https://developers.google.com/earth-engine/datasets/tags/nasa) [ornl](https://developers.google.com/earth-engine/datasets/tags/ornl) [precipitation](https://developers.google.com/earth-engine/datasets/tags/precipitation) [radiation](https://developers.google.com/earth-engine/datasets/tags/radiation) [snow](https://developers.google.com/earth-engine/datasets/tags/snow) [temperature](https://developers.google.com/earth-engine/datasets/tags/temperature) [vapor](https://developers.google.com/earth-engine/datasets/tags/vapor) [water](https://developers.google.com/earth-engine/datasets/tags/water) [weather](https://developers.google.com/earth-engine/datasets/tags/weather) [weather-and-climate](https://developers.google.com/earth-engine/datasets/tags/weather-and-climate) 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: - [ORNL DAAC Dataset Documentation](https://daac.ornl.gov/DAYMET/guides/Daymet_Daily_V4.html) - [Dataset Documentation](https://daac.ornl.gov/daacdata/daymet/Daymet_Daily_V4/comp/Daymet_Daily_V4.pdf) - [The THREDDS location for this Collection](https://thredds.daac.ornl.gov/thredds/catalogs/ornldaac/Regional_and_Global_Data/DAYMET_COLLECTIONS/DAYMET_COLLECTIONS.html) ### Bands **Bands** Pixel size: 1000 meters (all bands) | Name | Units | Min | Max | Pixel Size | Description | |---|---|---|---|---|---| | `dayl` | seconds | 0\* | 86400\* | 1000 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\* | 1000 meters | Daily total precipitation, sum of all forms converted to water-equivalent. | | `srad` | W/m\^2 | 0\* | 1051\* | 1000 meters | Incident shortwave radiation flux density, taken as an average over the daylight period of the day. | | `swe` | kg/m\^2 | 0\* | 13931\* | 1000 meters | Snow water equivalent, the amount of water contained within the snowpack. | | `tmax` | °C | -60\* | 60\* | 1000 meters | Daily maximum 2-meter air temperature. | | `tmin` | °C | -60\* | 42\* | 1000 meters | Daily minimum 2-meter air temperature. | | `vp` | Pa | 0\* | 8230\* | 1000 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](https://www.earthdata.nasa.gov/engage/open-data-services-and-software/data-and-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](https://doi.org/10.3334/ORNLDAAC/1840) ### DOIs - - ### Explore with Earth Engine > [!NOTE] > **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine) ### Code Editor (JavaScript) ```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](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_ORNL_DAYMET_V4) [Daymet V4: Daily Surface Weather and Climatological Summaries](https://developers.google.com/earth-engine/datasets/catalog/NASA_ORNL_DAYMET_V4) 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,weather-and-climate 1980-01-01T00:00:00Z/2025-12-31T00:00:00Z 1.6 -150.8 84 -1.1 Google Earth Engine https://developers.google.com/earth-engine/datasets - [https://doi.org/10.3334/ORNLDAAC/2129](https://doi.org/https://doi.org/10.3334/ORNLDAAC/1840) - [https://doi.org/10.3334/ORNLDAAC/2129](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_ORNL_DAYMET_V4)