observations:

Temperature 1854-2000 anomalies: Jones & Parker T2m/SST analysis
SST 1856-now anomalies: Kaplan SST reconstruction
  1945-1993 anomalies: Da Silva SST reconstruction
  1982-now: Reynolds OI SST
Precipitation: 1900-1998: CRU Hulme analysis
  1979-1999: the CPC Merged Analysis of Precipitation (Xie and Arkin)
  1851-1993 anomalies: NCDC analysis
Sea-level pressure 1871-1994: Hadley Centre reconstruction
  1873-1995 NH: Jones analysis
  1675-1715 Europe: Luterbacher Maunder Minimum reconstruction and 1961-1990 modern comparison.
Pressure at sea 1854-1992: COADS analysis
  1945-1993: Da Silva analysis
  1854-1992: Kaplan reconstruction
Snow cover 1966-1999: (NOAA, 1966-1972 monthly, 1973-1999 interpolated weekly)
Sea surface height 1992-now: DEOS analysis 1992-1999: old
Ocean heat content 1955-1998: JEDA analysis
Heat flux latent, 1945-1993: Da Silva analysis
Wind u, v 1991-2000: Ifremer/CERSAT ERS analysis
Wind stress taux tauy 1945-1993: Da Silva analysis
  taux tauy sep 1991-now: Ifremer/CERSAT ERS analysis
  taux tauy curl tau div tau Pacific wind stress 1961-now: the FSU analysis:
Ozon concentration 1978-1993: TOMS analysis
TAO data SST air temp u-wind v-wind z20 heat content
(home-interpolated from daily buoy measurements)

reanalyses:
  NCEP/NCAR 1958-1998: (many more variables and levels are available at their correlation page)   ERA-15 1979-1993 (note: 0-6 fluxes)
level surface 2m/10m 850mb 700mb 500mb 200mb    surface 2m/10m 850mb 700mb 500mb 200mb
slp/height      
zonal wind(stress)  
meridional wind(stress)  
temperature    
latent heat flux/humidity                
relative humidity            
relative vorticity        
vertical velocity                  
horizontal divergence        
vertical shear              
precipitation/OLR            
P-E                      
(please contact the administrator if you need other fields)