Suicide figures were examined for five large American cities (Los Angeles, Seattle, New York, Chicago, & Minneapolis) over an extended period of time. Sites were chosen on the basis of size, similarity in summer temperatures (with the exception of Seattle), & their contrast in winter temperatures. In none of the cities was there a clear correlation between average monthly temperature & the standardised suicide rate. If temperature change does influence the seasonal pattern of suicide or depression, the form of the relationship was not obvious in this study.