Data Alert:  25 November 2020

Updated February 1982 daily and monthly grids for tmax, tmin, tmean, tdmean, vpdmin, and vpdmax

PRISM daily and monthly grids for tmax, tmin, tmean, tdmean, vpdmin and vpdmax were recently updated for February 1982, after several 800m grid cells in SE Idaho and W Wyoming were found to be set to missing in the 06 Feb 1982 tmax grid. The 4km version derived from the 800m data was not affected directly, because the filtering algorithm ignored these grid cells in its areal averages. However, their subsequent inclusion changed the 4km values slightly. In addition, slight changes were propagated to other variables and other days in the month once inter-variable consistency and daily/monthly reconciliation adjustments were run. Overall, the update resulted in very minor changes to the grid values. The new grids have now replaced the old grids, and are available for download from the website, FTP site, and web services.

Summary of updated grids:


  • tmin, tmax, tmean: 06 Feb 1982 only
  • tdmean, vpdmin, vpdmax: Feb 1982 (all days)


  • vpdmin, vpdmax: Feb 1982