Table 1:
First-Order Stations (ISD-Lite) | USCRN Stations | PRISM | Daymet | |
---|---|---|---|---|
Spatial Coverage | 274 stations in the US, located primarily at airports | 137 stations in the US, located at sites minimally affected by anthropogenic land uses | Conterminous United States (CONUS) at horizontal spatial resolution of 4 km or 800 m | North America at horizontal spatial resolution of 1 km |
Temporal Coverage | Hourly or sub-hourly observations over the past several decades | Sub-hourly observations since as early as 2000 | Daily from 1981 to six months prior to present | Daily since 1980; updated annually |
Day Definition | 00:00 – 23:59 UTC | 00:00 – 23:59 UTC | 12:01 UTC on day i-1 - 12:00 UTC on day i | 00:00 – 23:59 UTC |
Meteorological Variables Reported | Temperature Dew-point T Precipitation Atm. Pressure Wind Cloud cover |
Temperature Relative humidity Precipitation Solar radiation IR surface T |
Tmin, Tmax, Tmean TDmean VPDmin, VPDmax Precipitation |
Tmin, Tmax VPmean Precipitation Solar radiation Snow-water eq. Day length |
User-Derived Variables | Heat index Relative humidity Absolute humidity |
Heat index Absolute humidity |
HImin, Hmax, HImean RHmin, RHmax, RHmean AHmean |
Tmean HImax, HImean RHmin, RHmean AHmean |
Table 1: Abbreviations: minimum, maximum, and mean temperature (Tmin, Tmax, and Tmean); mean vapor pressure (VPmean); minimum and maximum vapor-pressure deficits (VPDmin and VPDmax); minimum, maximum, and mean relative humidity (RHmin, RHmax, and RHmean); mean absolute humidity (AHmean); and minimum, maximum, and mean heat index (HImin, HImax, and HImean).