The impact of weather on the racial composition of traffic stop and citation issuance in the United States

We analyze how adverse weather influences the racial composition of traffic stops and the issuance of citations within the context of administrative discretion. The behavior of police officers and drivers may be affected by weather, leading to a change in the composition of stopped drivers. If changes in racial composition are due to police officers choosing to forego traffic stops because those are more costly in wet conditions, it could indicate racial bias. Based on data from 37 city and 11 state police departments, our analysis reveals that the racial composition of drivers stopped and the probability of a citation being issued are not independent of adverse weather conditions, especially for state agencies. These findings contribute to the existing literature on factors influencing police–citizen interactions and provide a foundation for investigating the potential connections among weather, administrative discretion, and racial bias.