DAYMET

Datasets:

• Daymet V4: Daily Surface Weather and Climatological Summaries

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.

Organization: NASA ORNL DACC at Oak Ridge National Library

Website: DAYMET Website

Google Earth Engine: 

• DAYMET Info (NASA/ORNL/DAYMET_V4)

Spatial resolution: 1-km grid (1/96-deg)

Time Span: 1980 to present full year (updates processed at the close of a calendar year)

Variables:

• Minimum/Maximum/Mean Temperature
• Precipitation
• Vapor Pressure
• Downward Shortwave Radiation (W/m^2)
  • Climate Engine is providing a 24-hour by modifying the daylight-average provided by Daymet. 
  • To go from Watts/m^2 to MJ/(m^2day) you need to multiply the number of sec in a day: watts/meter² x 86400 s/day x 1 MJ/10^6 J = MJ/(meter²*day).
• Snow Water Equivalent
• Standardized precipitation index (SPI)
• Potential Evapotranspiration (Hargreaves method)
• Potential Water Deficit (precipitation minus potential evapotranspiration)
• Evaporative Drought Demand Index (EDDI) utilizing the Hargreaves PET

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.

References:

• 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. https://doi.org/10.3334/ORNLDAAC/1840