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Full catalog/Daymet_Daily_V4R1_2129
Daymet_Daily_V4R1_2129·v4.1·dataset

Daily weather across North America (1 km grid)

Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 4 R1
atmosphere NASA ORNL_CLOUD Level 4 netCDF-4
In plain English

What it measures. Daily weather across North America on a 1-kilometer grid, including minimum and maximum temperature, precipitation, sunlight (shortwave radiation), humidity (vapor pressure), snow water content, and day length.

How it's made. Not from a satellite sensor but modeled: ground weather-station readings are interpolated onto a continuous 1-kilometer grid covering 1980 onward (1950 onward for Puerto Rico).

How & where you'd use it. Widely used for ecology, agriculture, hydrology and climate studies that need consistent daily weather everywhere, including places far from weather stations. The R1 update fixed earlier errors in 2020 and 2021 high-latitude data.

What's measured

ATMOSPHERE › ATMOSPHERIC TEMPERATURE › SURFACE TEMPERATURE › MAXIMUM/MINIMUM TEMPERATUREATMOSPHERE › PRECIPITATION › PRECIPITATION AMOUNT › 24 HOUR PRECIPITATION AMOUNTATMOSPHERE › PRECIPITATION › SNOW WATER EQUIVALENTATMOSPHERE › ATMOSPHERIC WATER VAPOR › WATER VAPOR INDICATORS › VAPOR PRESSUREATMOSPHERE › ATMOSPHERIC RADIATION › SHORTWAVE RADIATION

Coverage & cadence

  • Time span1950-01-01 → 2025-12-31
  • Measured byMODELS (Computer)
  • Processing levelLevel 4
  • Spatial extent-178.133, 14.0749, -53.0567, 82.9143
  • FormatsnetCDF-4
  • StatusCOMPLETE

What you can do with it

  • Map air pollutants — NO₂, aerosols, ozone
  • Track greenhouse gases and Earth's energy budget
  • Feed weather and air-quality analysis
Official description

This dataset provides Daymet Version 4 R1 data as gridded estimates of daily weather parameters for North America, Hawaii, and Puerto Rico. Daymet variables include the following parameters: minimum temperature, maximum temperature, precipitation, shortwave radiation, vapor pressure, snow water equivalent, and day length. The dataset covers the period from January 1, 1980, to December 31 (or December 30 in leap years) of the most recent full calendar year for the Continental North America and Hawaii spatial regions. Data for Puerto Rico is available starting in 1950. Each subsequent year is processed individually at the close of a calendar year. Daymet variables are provided as individual files, by variable and year, at a 1 km x 1 km spatial resolution and a daily temporal resolution. Areas of Hawaii and Puerto Rico are available as files separate from the continental North America. Data are in a North America Lambert Conformal Conic projection and are distributed in a standardized Climate and Forecast (CF)-compliant netCDF file format. In Version 4 R1, all 2020 and 2021 files were updated to improve predictions especially in high-latitude areas. It was found that input files used for deriving 2020 and 2021 data had, for a significant portion of Canadian weather stations, missing daily variable readings for the month of January. NCEI has corrected issues with the Environment Canada ingest feed which led to the missing readings. The revised 2020 and 2021 Daymet V4 R1 files were derived with new GHCNd inputs. Files outside of 2020 and 2021 have not changed from the previous V4 release.

Get the data

daymet_daily_v4r1_2129_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="Daymet_Daily_V4R1_2129",
    version="4.1",
    bounding_box=(-122.5, 37.2, -121.8, 37.9),  # your area (W,S,E,N)
    temporal=("2024-01-01", "2024-12-31"),       # your dates
)
files = earthaccess.open(results)   # stream straight from ORNL_CLOUD
Browsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.