| Datasets | Areal Coverage | Grid Size | Time Step | Time Coverage | Levels |
|---|---|---|---|---|---|
| CPC Hourly Precipitation | U.S. | 2.0°x2.5° | Hourly | 1948-2002 | None |
| GFS Model Output | Global | 2.5°x2.5° | 2X Daily | 1979-present | varied levels |
| MSU | Global | 2.5°x2.5° | Daily, Monthly | 1979-1996 | 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 |
| 20th Century Reanalysis (V2) | Global | 2.5°x2.5° | 4X Daily | 1871-2010 | 24 pressure levels |