ERA5 daily averaged data on single-levels

Name: ERA5 daily averaged data on single-levels
Creator: ECMWF

This is a subset of ERA5 data on single-levels variables derived from ERA5 post-processed daily statistics on single levels from 1940 to present. The data is available from 1940 until the last closed month and updated monthly and is gridded to a regular lat-lon grid of 0.25 degrees.

They are presented as a Zarr v3 archive optimised for both spatial and time analysis.

This dataset is produced by the Earth Data Hub Team based on the ERA5 hourly data on single levels dataset and uses the standard UTC day as a base for averages and accumulations. That is, the day starts at 00:00 UTC and ends at 23:59 UTC on all pixels irrespective of the latitude and the local time. Note that for accumulated variables, like the total precipitation tp, the original ECMWF data resets the values at the start of the UTC day on all latitudes already.

For instantaneous variables, e.g. the 2 meter temperature t2m, the operation applied is the Xarray .resample("D").mean() method. For accumulated variables the values are the total accumulation for the day.

Accessing this dataset requires a Zarr v3-compatible library (e.g., zarr-python >= 3.x). Python users can upgrade via pip install "zarr>3".

How to download the data

It's required to before running the code snippet below.

1import xarray as xr
2
3xr.open_dataset(
4    "https://data.earthdatahub.destine.eu/era5/era5-single-levels-atmosphere-daily-utc-v0.zarr",
5    storage_options={"client_kwargs":{"trust_env":True}},
6    chunks={},
7    engine="zarr",
8    zarr_format=3,
9)
10

Variables

Short Name	Units	Description
blh	m	Boundary layer height
cape	J kg^-1	Convective available potential energy
d2m	K	2 metre dewpoint temperature
ie	kg m^-2 s^-1	Instantaneous moisture flux
iews	N m^-2	Instantaneous eastward turbulent surface stress
inss	N m^-2	Instantaneous northward turbulent surface stress
ishf	W m^-2	Instantaneous surface sensible heat net flux
msl	Pa	Mean sea level pressure
sd	m of water equivalent	Snow depth
skt	K	Skin temperature
sst	K	Sea surface temperature
t2m	K	2 metre temperature
tcc	(0 - 1)	Total cloud cover
u10	m s^-1	10 metre U wind component
u100	m s^-1	100 metre U wind component
v10	m s^-1	10 metre V wind component
v100	m s^-1	100 metre V wind component
z	m² s^-2	Geopotential