The role of emotion during learning encounters in science teacher education is underresearched and under-theorized. In this case study, we explore the emotional climates (ECs), that is, the collective states of emotional arousal, of a preservice secondary science education class to illuminate practice for producing and reproducing high quality learning experiences for preservice science teachers. Theories related to the sociology of emotions informed our analyses from data sources such as preservice teachers' perceptions of the EC of their class, emotional facial expressions, classroom conversations, and cogenerative dialogue. The major outcome from our analyses was that even though preservice teachers reported high positive EC during the professor's science demonstrations, they also valued the professor's in the moment reflections on her teaching that were associated with low EC ratings. We co-relate EC data and preservice teachers' comments during cogenerative dialogue to expand our understanding of high quality experiences and EC in science teacher education. Our study also contributes refinements to research perspectives on EC.Despite a longstanding interest in research on the effectiveness of science-teacher education programs (e.g., James, 1971), few studies have investigated the synergy between emotions, emotional climate (EC), and the quality of science teacher education in university classes. Briefly, EC refers to the collective experience of emotional arousal that develops among groups of people. James' (1971) work provides one example of early interest on the role of general affective states (i.e., attitudes) in preservice science teacher education. Her study explored whether three different supervisory models used in conjunction with practicum had any effect on preservice science teachers' attitudes toward a desirable teaching strategy (i.e., an inductive-indirect teaching technique). Relationships between teacher attitudes and the teaching technique were established through statistical analyses of pre-and post-test data from questionnaires. The group of teachers who received traditional visits from a university supervisor supplemented by self-evaluation sessions using video data of their teaching showed the largest change toward the desired teaching