Abstract: Based on the Automatic Weather Observation System (AWOS) data from Chongqing Jiangbei Airport (2023—2024) and the corresponding flight departure data from various runway ends, the distribution characteristics of low Runway Visual Range (RVR) values at specific runway ends was examined, and the impact of low RVR values under the new Civil Aviation Administration standards on airport departure operational efficiency was evaluated. The results indicate that the most severe low RVR conditions occurred at End 03 of the Third Runway, which serves as the main take-off runway. The number of days and occurrences of low RVR reached 203 days and 218 times, respectively, with a total duration of 79.5 hours, ranking first among all runways in all three metrics. The frequency of partial fog at End 03 was highest in autumn, followed by summer and spring, and lowest in winter. Under different operational modes, the Third Runway consistently remained the primary departure runway. The operational duration and number of departures from End 03 were approximately three times those of End 21 on the same runway. When low RVR occurs only at End 03, operational modes S311, S313, and S133 are prioritized in sequence (or N311, N313, and N133 if tailwind limits are exceeded). This ensures that airlines requiring dual-segment RVR control can perform takeoffs from the Third Runway. Additionally, flights unable to depart from the Third Runway can taxi to the Second Runway for takeoff, thereby avoiding runway crossings and aircraft conflicts.