Daily-resolution observed climate data on a global (land only) 0.5°x0.5° lat-lon grid, based on the reanalysis data sets ERA-40 (for WATCH) and ERA-Interim (for WFDEI) and using the bias correction target GPCC for monthly rainfall and snowfall sums. The data set covers the period 1901‐2012, where the data for 1901-1978 are taken from WATCH, and from 1979 onwards from WFDEI.
*Note* discontinuity in the data exists at the transition from WATCH to WFDEI, and results must be interpreted with caution.
When referring to this data set, the following papers should be cited:
Weedon, G.P., S.S. Gomes, P.P. Viterbo, W.J. Shuttleworth, E.E. Blyth, H.H. Österle, J.C. Adam, N.N. Bellouin, O.O. Boucher, and M.M. Best, 2011: Creation of the WATCH Forcing Data and Its Use to Assess Global and Regional Reference Crop Evaporation over Land during the Twentieth Century. J. Hydrometeor., 12, 823–848, doi: 10.1175/2011JHM1369.1
Weedon, G. P., G. Balsamo, N. Bellouin, S. Gomes, M. J. Best, and P. Viterbo (2014), The WFDEI meteorological forcing data set: WATCH Forcing Data methodology applied to ERA-Interim reanalysis data, Water Resour. Res., 50, 7505–7514, doi:10.1002/2014WR015638.
For ISIMIP participants, these files are available for download on the DKRZ server using the path
For external users, these data are made available on the ISIMIP data portal under the link shown below