The study presents a global 1° × 1° climatology of the first baroclinic Rossby radius of deformation and the first baroclinic gravity-wave phase speed, derived from climatological average temperature and salinity profiles. The new atlases are compared with previously published coarse-resolution maps, revealing systematic biases of 5%–15% due to computational errors. The geographical variations in these quantities are discussed using a WKB approximation, which highlights the effects of Earth rotation, stratification, and water depth. The study also investigates the sensitivity of the Rossby radius to temporal variability of stratification, finding that seasonal variations are small and that temporal variations on intraseasonal and interannual timescales are generally less than 10%. The results suggest that previous estimates of the baroclinic Rossby radius were systematically low, which may account for discrepancies observed in midlatitude sea level signals propagating westward in the World Ocean.The study presents a global 1° × 1° climatology of the first baroclinic Rossby radius of deformation and the first baroclinic gravity-wave phase speed, derived from climatological average temperature and salinity profiles. The new atlases are compared with previously published coarse-resolution maps, revealing systematic biases of 5%–15% due to computational errors. The geographical variations in these quantities are discussed using a WKB approximation, which highlights the effects of Earth rotation, stratification, and water depth. The study also investigates the sensitivity of the Rossby radius to temporal variability of stratification, finding that seasonal variations are small and that temporal variations on intraseasonal and interannual timescales are generally less than 10%. The results suggest that previous estimates of the baroclinic Rossby radius were systematically low, which may account for discrepancies observed in midlatitude sea level signals propagating westward in the World Ocean.