Pediatric patients with asthma are known to be exacerbated in autumn. On the other hand, there were few reports about the seasonal change of asthma control in the patients with adult asthma. In the present study, we conducted a questionnaire survey in 200 out patients with asthma to evaluate the climate which deteriorates asthma control. The patients whose asthmatic control was influenced by the specific climate were 141 (70.5%). The average age was younger and the percentage of moderate to severe was higher in the group whose asthma control was influenced by the specific climate than in the group whose asthma control was not influenced. The climate chosen the most as an inducer of asthma exacerbation was autumn, and the less was summer. Regarding to the severity, mild patients were tend to deteriorate in autumn, and moderate-to-severe patients were in winter. Meanwhile, the most climate chosen by the patients who had an obstructive ventilator disorder was winter, and the most climate chosen by the patients who did not have was autumn. These findings suggest that patients with asthma are influenced the most in autumn and severe asthma patients are in winter.