This study evaluates precipitation properties involved in tropical cyclogenesis by analyzing a multi-year, global database of passive microwave overpasses of the pre-genesis stage of developing disturbances and nondeveloping disturbances. Precipitation statistics are quantified using brightness temperature proxies from the 85–91-GHz channels of multiple spaceborne sensors, as well as retrieved rain rates. Proxies focus on the overall raining area, areal coverage of deep convection, and the proximity of precipitation to the disturbance center. Of interest are the differences in those proxies for developing versus nondeveloping disturbances, how the properties evolve during the pre-genesis stage, and how they differ globally. The results indicate that of all of the proxies examined, the total raining area and rain volume near the circulation center are the most useful precipitation-related predictor for genesis. The areal coverage of deep convection also differentiates developing from nondeveloping disturbances and, similar to the total raining area, generally also increases during the pre-genesis stage, particularly within a day of genesis. As the threshold convective intensity is increased, pre-genesis cases are less distinguishable from nondeveloping. Compared to the western Pacific and Indian Oceans, the Atlantic and eastern North Pacific have less precipitation and deep convection observed during genesis and the smallest differences between developing and nondeveloping disturbances. This suggests that the total raining area and areal coverage of deep convection associated with tropical disturbances are better predictors of tropical cyclogenesis fate in the Pacific and Indian Oceans than in the Atlantic and eastern North Pacific.