The present study investigated whether the classroom social climate varies between lessons. Specifically, the within- and across-lesson associations of coercive and supportive teacher behaviour incidents with the classroom social climate were studied. Participants in the study were 48 Dutch secondary school teachers and their classes, that is, 1208 students. Multilevel process analyses showed that supportive behaviour incidents correlated with a positive social climate during the current lesson and the lesson a week later in terms of teacher interpersonal proximity. Supportive behaviour incidents did not, however, correlate with social climate in terms of teacher interpersonal influence. Coercive behaviour incidents correlated with disrupted teacher proximity during the current lesson and the lesson a week later, but did not virtually correlate to increased levels of a teacher's influence in the classroom. (Contains 2 tables.)