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more information mean daily NMC reanalysis (1948)
X axis: whole world in 144 2.50° steps, first point at 0.00° E, last point at 357.50° E
Y axis: regular grid with 73 -2.50° steps, first point at 90.00° N, last point at 90.00° S

1-daily data available from 01Jan1948 to 07Aug2020 ( 26572 times)
Variable slp (mean Daily Sea Level Pressure) in Pascals
Full metadata.

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Please consider downloading this field from the authoritative site.
If you really want to get it here, NCEP/NCAR SLP is available as a netcdf file (size 425.88 MB).