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HadISDH data download - version 4.6.0.2023f

The current version of HadISDH is 4.6.0.2023f. For previous versions please contact the dataset maintainers.

These data are available under a free and unrestricted Open Government Licence UK.

NetCDF gridded files contain fields on 5° by 5° resolution from -177.5° W/87.5° N to 177.5° E/-87.5° S.

NetCDF station files contain monthly time series from January 1973 to December 2022.

Missing data are represented by -1e30.

Variables are described below.

The ASCII good station list file contains a WMO identifier (digits 0-5 (a6)), a WBAN identifier (digits 6-10 (a5)), a latitude (digits 11-19 (f9.4)), a longitude (digits 20-29 (f10.4)), an elevation in metres (digits 29-35 (f7.1)), space, a country ID (digits 37-39 (a2)), space, and a name (digits 41-72 (a32)).

The ASCII list of stations with subzero and supersaturated issues contain a WMO identifier (digits 0-5 (a6)), a WBAN identifier (digits 6-10 (a5)), the total number of affected months (digits 28-30 (i3)) and the total number of non-missing months (digits 32-34 (i3)).

The ASCII version of the gridded data lists each month in turn with 72 columns of longitude (-177.5 to 177.5 grid cell centres) and 36 rows of latitude (-87.5 to 87.5 grid cell centres). The longitudes and latitudes are listed at file end.

Product	Description	Data file

HadISDH.land*.4.6.0.2023f grids NetCDF	Land surface grids and uncertainty	HadISDH.landq.4.6.0.2023f_FLATgridHOM5by5_anoms9120.nc, HadISDH.landRH.4.6.0.2023f_FLATgridHOM5by5_anoms9120.nc, HadISDH.lande.4.6.0.2023f_FLATgridHOM5by5_anoms9120.nc, HadISDH.landTd.4.6.0.2023f_FLATgridHOM5by5_anoms9120.nc, HadISDH.landTw.4.6.0.2023f_FLATgridHOM5by5_anoms9120.nc, HadISDH.landT.4.6.0.2023f_FLATgridHOM5by5_anoms9120.nc, HadISDH.landDPD.4.6.0.2023f_FLATgridHOM5by5_anoms9120.nc,
HadISDH.land*.4.6.0.2023f grids ASCII	Land surface anomalies relative to 1991-2020	HadISDH.landq.4.6.0.2023f_FLATgridHOM5by5_anoms9120_anomalies.txt, HadISDH.landRH.4.6.0.2023f_FLATgridHOM5by5_anoms9120_anomalies.txt, HadISDH.lande.4.6.0.2023f_FLATgridHOM5by5_anoms9120_anomalies.txt, HadISDH.landTd.4.6.0.2023f_FLATgridHOM5by5_anoms9120_anomalies.txt, HadISDH.landTw.4.6.0.2023f_FLATgridHOM5by5_anoms9120_anomalies.txt, HadISDH.landT.4.6.0.2023f_FLATgridHOM5by5_anoms9120_anomalies.txt, HadISDH.landDPD.4.6.0.2023f_FLATgridHOM5by5_anoms9120_anomalies.txt,
HadISDH.land*.4.6.0.2023f grids ASCII	Land surface actual values	HadISDH.landq.4.6.0.2023f_FLATgridHOM5by5_anoms9120_actuals.txt, HadISDH.landRH.4.6.0.2023f_FLATgridHOM5by5_anoms9120_actuals.txt, HadISDH.lande.4.6.0.2023f_FLATgridHOM5by5_anoms9120_actuals.txt, HadISDH.landTd.4.6.0.2023f_FLATgridHOM5by5_anoms9120_actuals.txt, HadISDH.landTw.4.6.0.2023f_FLATgridHOM5by5_anoms9120_actuals.txt, HadISDH.landT.4.6.0.2023f_FLATgridHOM5by5_anoms9120_actuals.txt, HadISDH.landDPD.4.6.0.2023f_FLATgridHOM5by5_anoms9120_actuals.txt,
HadISDH.land*.4.6.0.2023f grids ASCII	Land surface uncertainty (2 sigma) including station (measurement, inhomogeneity and climatology) and grid-box sampling	HadISDH.landq.4.6.0.2023f_FLATgridHOM5by5_anoms9120_2sig_uncertainty.txt, HadISDH.landRH.4.6.0.2023f_FLATgridHOM5by5_anoms9120_2sig_uncertainty.txt, HadISDH.lande.4.6.0.2023f_FLATgridHOM5by5_anoms9120_2sig_uncertainty.txt, HadISDH.landTd.4.6.0.2023f_FLATgridHOM5by5_anoms9120_2sig_uncertainty.txt, HadISDH.landTw.4.6.0.2023f_FLATgridHOM5by5_anoms9120_2sig_uncertainty.txt, HadISDH.landT.4.6.0.2023f_FLATgridHOM5by5_anoms9120_2sig_uncertainty.txt, HadISDH.landDPD.4.6.0.2023f_FLATgridHOM5by5_anoms9120_2sig_uncertainty.txt,
HadISDH.land*.4.6.0.2023f stations NetCDF	Land surface stations and uncertainty tarball (tar -xzf to unpack)	HadISDH.landq.4.6.0.2023f.stations, HadISDH.landRH.4.6.0.2023f.stations, HadISDH.lande.4.6.0.2023f.stations, HadISDH.landTd.4.6.0.2023f.stations, HadISDH.landTw.4.6.0.2023f.stations, HadISDH.landT.4.6.0.2023f.stations, HadISDH.landDPD.4.6.0.2023f.stations
HadISDH.land*.4.6.0.2023f good station list ASCII	Stations by WMO identifier, latitude, longitude and elevation	PosthomogIDPHAq_anoms9120_goodsHadISDH.4.6.0.2023f.txt, PosthomogIDPHArh_anoms9120_goodsHadISDH.4.6.0.2023f.txt, PosthomogIDPHAe_anoms9120_goodsHadISDH.4.6.0.2023f.txt, PosthomogPHADPDtd_anoms9120_goodsHadISDH.4.6.0.2023f.txt, PosthomogIDPHAtw_anoms9120_goodsHadISDH.4.6.0.2023f.txt, PosthomogIDPHAt_anoms9120_goodsHadISDH.4.6.0.2023f.txt, PosthomogPHAdpd_anoms9120_goodsHadISDH.4.6.0.2023f.txt
HadISDH.land*.4.6.0.2023f sub-zero values station list ASCII	Stations by WMO identifier, latitude, longitude and elevation	PosthomogIDPHAq_anoms9120_subzerosHadISDH.4.6.0.2023f.txt, PosthomogIDPHAe_anoms9120_subzerosHadISDH.4.6.0.2023f.txt
HadISDH.land*.4.6.0.2023f supersaturated values station list ASCII	Stations by WMO identifier, latitude, longitude and elevation	PosthomogIDPHAq_anoms9120_satsHadISDH.4.6.0.2023f.txt, PosthomogIDPHArh_anoms9120_satsHadISDH.4.6.0.2023f.txt, PosthomogIDPHAe_anoms9120_satsHadISDH.4.6.0.2023f.txt, PosthomogPHADPDtd_anoms9120_satsHadISDH.4.6.0.2023f.txt, PosthomogIDPHAtw_anoms9120_satsHadISDH.4.6.0.2023f.txt, PosthomogPHAdpd_anoms9120_satsHadISDH.4.6.0.2023f.txt

NetCDF gridded file field	Description	Dimensions

q_abs, rh_abs, e_abs, td_abs, tw_abs, t_abs, dpd_abs	Monthly mean values	72 by 36 by 612
q_anoms, rh_anoms, e_anoms, td_anoms, tw_anoms, t_anoms, dpd_anoms	Monthly mean climate anomaly from the 1991-2020 climatology period (only climatological mean subtracted, not standardised)	72 by 36 by 612
q_std, rh_std, e_std, td_std, tw_std, t_std, dpd_std	Standard deviation of all station monthly mean anomalies within the gridbox for each month	72 by 36 by 612
q_combinederr, rh_combinederr, e_combinederr, td_combinederr, tw_combinederr, t_combinederr, dpd_combinederr	Station uncertainty and sampling uncertainty combined in quadrature to give a 2σ uncertainty	72 by 36 by 612
q_samplingerr, rh_samplingerr, e_samplingerr, td_samplingerr, tw_samplingerr, t_samplingerr, dpd_samplingerr	2σ Spatio-temporal sampling uncertainty within the gridbox	72 by 36 by 612
q_rbar, rh_rbar, e_rbar, td_rbar, tw_rbar, t_rbar, dpd_rbar	Average inter-site correlation	72 by 36
q_sbarSQ, rh_sbarSQ, e_sbarSQ, td_sbarSQ, tw_sbarSQ, t_sbarSQ, dpd_sbarSQ	Estimate of the mean variance of individual stations in the gridbox	72 by 36
q_stationerr, rh_stationerr, e_stationerr, td_stationerr, tw_stationerr, t_stationerr, dpd_stationerr	Climatological, measurement and adjustment uncertainty combined in quadrature to give a 2σ station uncertainty	72 by 36 by 612
q_adjerr, rh_adjerr, e_adjerr, td_adjerr, tw_adjerr, t_adjerr, dpd_adjerr	2σ adjustment uncertainty for inhomogeneity in the data	72 by 36 by 612
q_obserr, rh_obserr, e_obserr, td_obserr, tw_obserr, t_obserr, dpd_obserr	2σ measurement uncertainty	72 by 36 by 612
q_climerr, rh_climerr, e_climerr, td_climerr, tw_climerr, t_climerr, dpd_climerr	2σ climatological uncertainty	72 by 36 by 612
q_clims, rh_clims, e_clims, td_clims, tw_clims, t_clims, dpd_clims	Monthly climatologies over the 1991-2020 period	72 by 36 by 12
mean_n_stations	Total number of stations within the gridbox over entire record	72 by 36
actual_n_stations	Actual number of stations within the gridbox for each time step	72 by 36 by 612
latitude	Latitude in 5°	72 by 36
longitude	Longitude in 5°	72 by 36
time	Gregorian: Days since 1st January 1973 00:00:00	612
months	1-12	12

NetCDF station file field	Description	Dimensions

*_abs	Monthly mean value	612
*_anoms	Monthly mean anomaly from the 1991-2020 climatology period (climate anomaly, not standardised)	612
*_stds	Standard deviation of all station monthly mean anomalies within the gridbox for each month	612
*_uncertainty	Climatological, measurement and adjustment uncertainty combined in quadrature to give a 2σ station uncertainty	612
*_adjerr	2σ adjustment uncertainty	612
*_obserr	2σ measurement uncertainty	612
*_climerr	2σ climatological uncertainty	612
*_clims	Monthly climatologies over the 1991-2020 period	12
times	Months since January 1973	612
months	1-12	12

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