NCEP1

NCEP/NCAR

192 × 94 (1.875)

1948-present

NCEP2

NCEP/DOE

192 × 94 (1.875)

1979-present

ERA Interim

ECMWF

240 × 121 (1.5)

1979-present

GPCP

GSFC

360 × 180 (1.0)

1997-present