Monthly tdmean (mean dew point) grids were recently found to be systematically 0.5-1.0 ⁰C too low across the CONUS. This was caused by an erroneous post-processing script. The daily tdmean grids were not affected, and all other elements (monthly and daily) were also not affected. The time period at issue is 1895-2020 for both AN and LT datasets. The corrected monthly tdmean grids are available on this website and via FTP and web services.