Examining the season of birth of those with psychiatric disorders is not a new idea. It has long been recognized that patients suffering from schizophrenia are more likely to be born in the first three months of the year (Barry & Barry, 1961; Editorial,1978;Hare & Price, 1968;Pulver, Stewart, Carpenter, & Childs, 1983;Torrey, Torrey, & Peterson, 1977). Similar data is available showing a higher winter birth rate for those with Bipolar Disorder (Barry & Barry, 1961, Hare & Price, 1968Hare, Price, & Slater, 1973) and for those with mental retardation (Knobloch & Pasamanick, 1958). Because 44% (Robins, Murphy, & Wilkinson, 1959;Roy, 1982) to 64% (Barraclough, Bunch, Nelson, & Sainsbury, 1974) of all suicide victims suffer from depression, and an additional fraction ranging from 2% (Barraclough et al., 2 VOLUME 8, NUMBER 1 1974;Robins et al., 1959) to 38% (Roy, 1982) suffer from schizophrenia, the authors were interested to see if a seasonal difference in birth rate exists for suicide victims.Previous work on month of birth of suicide victims produced inconsistent results. Two studies showed an excess of summer births in suicide victims. Pokorney (1960) in a survey of only 44 suicide victims showed a marked increase in a July birth month. Lester, Reeve, and Priebe (1970) showed no significant difference in month of birth of suicide victims, but found a slight excess of summer births. However, others did not find a seasonal difference. Sanborn and Sanborn (1974) found no significant differences in month of birth of suicide victims, and Beck and Lester (1973) found no significant differences in month of birth of suicide attempters. All of these studies examined suicide birth month at only one location. We examined suicide birth rates in different seasons among Alaska Natives.Seasonal suicide rates for Alaska Natives were initially examined because of high suicide rates for that population-both compared to the general U.S. population as well as to suicide rates for the Alaska state population as a whole. The non-native population of the state is relatively transient and would have been far less likely to be born in Alaska compared to Alaska Natives who were born and lived in their native state. So the authors did not examine birth dates of non-native Alaskan suicide victims since they were less likely to be born in Alaska.To study seasonal differences in suicide birth month, however, it would clearly be most advantageous to study suicide birth rates at different locations, at different latitudes, where seasonal influences would vary. More northern latitudes have larger differences between seasons than more southern latitudes. Should any seasonal difference in suicide birth rate occur, the effects should be most prominent where seasonal differences are most prominent. Accordingly, these differences should gradually decrease as latitude and intensity of seasonal differences decrease.Others have suggested that seasonal effects on mood vary by latitude. Rosenthal et al. (1988) demonstrated different seasonal changes of...