Daymet V3: Daily Surface Weather and Climatological Summaries (NASA/ORNL/DAYMET_V3)

Version V3

Daymet V3 provides gridded estimates of daily weather parameters for
United States, Mexico, Canada, Hawaii, and Puerto Rico. It is derived
from selected meteorological station data and various supporting data

Compared to the previous version, Daymet V3 uses an entirely new suite
of inputs including:

  • NASA SRTM DEM version 2.1.

  • Land/Water Mask: MODIS 250 MOD44W_v2.NASA_ORNL_

  • Horizon files derived from the SRTM DEM.

  • Ground station weather inputs from several sources with QA/QC.

NameDescriptionGee Unit
daylDuration of the daylight period. Based on the period of the day during which the sun is above a hypothetical flat horizon.seconds
prcpDaily total precipitation, sum of all forms converted to
sradIncident shortwave radiation flux density, taken as an average over the daylight period of the day.W/m^2
sweSnow water equivalent, the amount of water contained within the^2
tmaxDaily maximum 2-meter air temperature.°C
tminDaily minimum 2-meter air temperature.°C
vpDaily average partial pressure of water vapor.Pa


NASA ORNL (producer, licensor)
Google Earth Engine (host)
STAC Version 0.6.0
Keywords climate, daily, daylight, daymet, flux, geophysical, nasa, ornl, precipitation, radiation, snow, temperature, vapor, water, weather
License proprietary
Temporal Extent 12/31/1979, 4:00:00 PM - now
Citation Thornton, P.E., M.M. Thornton, B.W. Mayer, Y. Wei, R. Devarakonda, R.S.Vose, and R.B. Cook. {YEAR}. Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version3. ORNL DAAC, Oak Ridge, Tennessee, USA
Type image_collection
GSD metersm
Cadence day