Using the hourly observation data of rain, relative humidity, wind direction, wind speed, and minimum visibility in the same period from 70 national weather stations in Jiangsu Province, the impacts of different rainfall intensities on visibility was analyzed, and the statistical characteristics of two types of rainfalls with different intensities, which caused low-visibility weather, were compared and analyzed. The results showed that rainfall was the major reason for low-visibility weather in Jiangsu(14.5%) besides fog. Stable weak rainfall and short-time heavy rainfall showed the most obvious impacts. Unlike the low-visibility weather events caused by fogs, those caused by rainfalls may occur at any time throughout the day usually with high wind speeds(>2 m/s). In 26.6% of these events, wind speed would be>4 m/s. Winter and spring were seasons with most frequent rain fog weather in Jiangsu, which was mainly affected by the duration of rainfalls. The corresponding low visibility range was 500-1 000 m with obvious diurnal variations. Short-time heavy rainfall fog weather was mainly affected by the intensity of rainfalls, which mostly occurred during June and September, and the corresponding low-visibility range was less than 200 m without obvious diurnal variations. There was obvious spatial distribution difference between the low visibility weather events caused by the two types of rainfalls. When the rain fog weather occurred, the northerly wind dominated;when the short-time heavy rainfall fog weather occurred, the easterly wind dominated.