| Datasets | Areal Coverage | Grid Size | Time Step | Time Coverage | Levels |
|---|
| CMAP Precipitation
| Global | 2.5°x2.5° |
Monthly,Pentad | 1979- | None |
| COBE SST
| Global | 1.0°x1.0° |
Monthly | 1891-present | None |
| CPC .25x.25 Daily US Unified Precipitation
| U.S. | .25°x.25° | Daily | 1948-1998 | None |
| CPC Hourly Precipitation
| U.S. | 2.0°x2.5° | Hourly | 1948-2002 | None |
| CPC Soil Moisture
| Global | 2.5°x2.5° |
Monthly | 1948-present | None |
| CRU Air Temperature and Combined Air Temperature/Marine Anomalies V3
| Global | 5.0°x5.0° |
Monthly | 1850-present | None |
| CRU Air Temperature and Combined Air Temperature/Marine Anomalies V4
| Global | 5.0°x5.0° |
Monthly | 1850-2013 | None |
| ERA-Interim Reanalysis
| Global | 0.7°x0.7° |
4-times daily | 1979-near present | None |
| Dai Palmer Drought Severity Index
| Global: 58S-76N | 2.5°x2.5° |
Monthly | 1870-2003 | None |
| GFS Model Output
| Global | 2.5°x2.5° |
2X Daily | 1979-present | varied levels |
NOAA GHCN_CAMS Land Temperature Analysis 
| Global | 0.5°x0.5° |
Monthly | 1948-present | None |
| GISS surface temperature analysis
| Global | 1.0°x1.0° |
Monthly | 1880-present | None |
| NCEP GODAS ocean analysis
| Global | .3°x.3° |
Monthly | 1980- |
40 |
| Global Precipitation Climatology Centre (GPCC)
| Global | 0.5°x0.5°,1.0°x1.0°, 2.5°x2.5° |
Monthly | 1901-present | None |
| GPCP V2.2 Precipitation
| Global | 2.5°x2.5° |
Monthly | 1979-2005 | None |
| Hadley Sea Ice SST
| Global | 1.0°x1.0° |
Monthly | Jan 1870-present | None |
| ICOADS
| Global | 2.0°x2.0°,1.0°x1.0° |
Monthly | 1800-present | None |
| Interpolated OLR
| Global | 2.5°x2.5° |
Daily,Monthly | 1979-near present | None |
| Kaplan SST
| Global | 5.0°x5.0° |
Monthly | 1856-present | None |
| MSU
| Global | 2.5°x2.5° |
Daily, Monthly | 1979-1996 | None |
| NCEP Operational Analysis
| Global | 2.5°x2.5° |
Daily | 1979-2005 | None |
| NCEP Marine
| Global | 2.0°x2.0° |
Monthly | 1991-present | None |
| NCEP/NCAR Reanalysis
| Global | 2.5°x2.5°, T42 Gaussian, T62 spectral |
4X Daily, Daily, Monthly | 1948-present | 17 pressure levels, 28 spectral |
| NCEP/NCAR Reanalysis Products Derived at PSD
| Global | 2.5°x2.5°, T62 Gaussian |
Daily, Monthly | 1948-present | 17 pressure levels, 28 spectral |
| NCEP/DOE Reanalysis II
| Global | 2.5°x2.5° |
4X Daily, Daily, Monthly | 1979-Dec 2008 | 17 Pressure levels |
| NOAA Extended Reconstructed SST
| Global | 1.0°x1.0° |
Monthly | 1854-present | None |
| NOAA High-resolution Blended Analysis of Daily SST and Ice.
| Global | .25°x.25° |
Daily | 1985-present |
None |
| NOAA Merged Land-Ocean Surface Temperature Analysis (MLOST) V3.5.3
| Global | 5.0°x5.0° |
Monthly | 1880-present | None |
| NOAA Optimum Interpolation (OI) SST V2
| Global | 1.0°x1.0° |
Monthly,Weekly | 1981-present | None |
| NOAA Highly Reflective Clouds
| Tropics | 1.0°x1.0° |
Daily, Monthly | 1971-1988 | None |
| NODC (Levitus) World Ocean Atlas 1994
| Global | 1.0°x1.0° |
Monthly,Annual | Climo | None |
| NODC (Levitus) World Ocean Atlas 1998
| Global | 1.0°x1.0° |
Monthly,Annual | Climo | None |
| NOAA's Precipitation Reconstruction (PREC)
| Global | 2.5°x2.5° |
Monthly | 1979-present | None |
| NOAA's Precipitation Reconstruction over Land (PREC/L)
| Global | 2.5°x2.5° |
Monthly | 1948-2010 | None |
| PSD South America Daily Gridded Precipitation
| South America | 2.5°x2.5°, 1.0°x1.0° | Daily | 1940-near present | None |
| North American Regional Reanalysis (NARR)
| Northern Hemisphere | 32km grids |
8X Daily, Daily, Monthly | 1979-Jul 2009 | 28 Pressure |
| Northern Hemisphere EASE-Grid Snow Cover and Sea Ice Extent
| Northern Hemisphere | 1.0°x1.0° |
Monthly | 1971-1995 | None |
| 20th Century Reanalysis (V2)
| Global | 2.5°x2.5° |
4X Daily | 1871-2010 | 24 pressure levels |
| U. of Delaware Precipitation and Air Temperature
| Global Land | 0.5°x0.5° |
Monthly | 1950-1999 | None |
| Uninterpolated OLR
| Global | 2.5°x2.5° |
Daily | 1991-present | None |