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Full catalog/Daymet_Monthly_V4R1_2131
Daymet_Monthly_V4R1_2131·v4.1·dataset

Monthly weather summaries for North America (1 km)

Daymet: Monthly Climate Summaries on a 1-km Grid for North America, Version 4 R1
atmosphere NASA ORNL_CLOUD Level 4 COG
In plain English

What it measures. Monthly weather summaries for North America at a fine 1-km scale, covering minimum and maximum temperature, precipitation totals, humidity (vapor pressure), and snow water content.

How it's made. Calculated by rolling up Daymet's daily gridded weather estimates, which are modeled from ground weather-station data, into monthly figures.

How & where you'd use it. Widely used in ecology, agriculture, hydrology, and climate studies that need consistent, detailed weather data across the continent.

What's measured

ATMOSPHERE › PRECIPITATION › PRECIPITATION AMOUNTATMOSPHERE › ATMOSPHERIC TEMPERATURE › SURFACE TEMPERATURE › MAXIMUM/MINIMUM TEMPERATUREATMOSPHERE › ATMOSPHERIC RADIATION › SHORTWAVE RADIATIONTERRESTRIAL HYDROSPHERE › SNOW/ICE › SNOW WATER EQUIVALENTATMOSPHERE › ATMOSPHERIC WATER VAPOR › WATER VAPOR INDICATORS › VAPOR PRESSURE

Coverage & cadence

  • Time span1950-01-01 → 2024-12-31
  • Measured byMODELS (Computer)
  • Processing levelLevel 4
  • Spatial extent-178.133, 14.0749, -53.0567, 82.9143
  • FormatsCOG
  • 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 monthly climate summaries derived from Daymet Version 4 R1 daily data at a 1 km x 1 km spatial resolution for five Daymet variables: minimum and maximum temperature, precipitation, vapor pressure, and snow water equivalent. Monthly averages are provided for minimum and maximum temperature, vapor pressure, and snow water equivalent, and monthly totals are provided for the precipitation variable. Each data file is yearly by variable with 12 monthly time steps and covers the same period of record as the Daymet V4 R1 daily data. The monthly climatology files are derived from the larger datasets of daily weather parameters produced on a 1 km x 1 km grid for North America, Hawaii, and Puerto Rico. Separate monthly files are provided for the land areas of continental North America (Canada, the United States, and Mexico), Hawaii, and Puerto Rico. Data are distributed in standardized Climate and Forecast (CF)-compliant netCDF (*.nc) and Cloud-Optimized GeoTIFF (*.tif) formats. In Version 4 R1 (ver 4.1), all 2020 and 2021 files (60 total) 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_monthly_v4r1_2131_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="Daymet_Monthly_V4R1_2131",
    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.