Manual shipboard present weather reports from 1950 to 2019 are aggregated and composited yearly and seasonally on a $1^\circ \times 1^\circ$ grid to characterize the global climatology and long-term trends in the relative frequency of four categories of oceanic precipitation: drizzle, moderate and heavy non-drizzle, precipitation associated with thunderstorms and deep convection, and frozen-phase precipitation. Although ship reports are susceptible to subjective interpretation, the inferred distributions of these phenomena are consistent with datasets derived from other platforms. These distributions highlight widespread 70-year trends that are often consistent across both annual and seasonal frequencies, with statistical significance at 95\% confidence. The relative frequency of ship-reported drizzle has largely increased in the tropics annually and seasonally, with linear best-fit relative increases by as much as 15\% per decade. Decreased relative frequencies have been observed in parts of the subtropics and at higher latitudes. Heavier precipitation has encompassed a growing fraction of non-drizzle precipitation reports over the subtropical North Pacific and Mediterranean. The relative frequency of thunderstorm reports has declined over the open Atlantic but show positive trends over the Mediterranean and the western Atlantic. The trends in relative frozen precipitation occurrence suggest a poleward retreat of areas receiving frozen precipitation in the Northern Hemisphere. Possible mechanisms for these ship-observed trends are discussed and placed in the context of the modeled effects of climate change on global precipitation.

Ship present-weather reports from 1950 through 2019 are used to assess trends in the reporting of precipitation occurrence over the global oceans. Annual reported precipitation frequency shows statistically significant positive trends of up to $\sim$15\% per decade throughout most ocean areas equatorward of 45 degrees. However, latitudes poleward of 45 degrees are dominated by negative trends, some areas of which meet the 95\% confidence threshold. Nine smaller regions were subjectively selected for further investigation, revealing that the observed trends, both positive and negative, are often but not always nearly linear, with the amplitude of interannual fluctuations usually being much larger than that expected from random sampling error alone. The annual time series reveal that four comparatively dry areas are associated with the largest overall positive trends, ranging from 8.3\% to 12.8\% (relative) per decade. Trends were also computed separately for each season, revealing remarkable overall consistency in trends across seasons.