Do volcanic eruptions have a tendency to occur more frequently in the months of May and June? Some past evidence suggests they do. The present study, based on the new eruption catalogue of Simkin et al., investigates the monthly statistics of the largest eruptions, grouped according to explosive magnitude, geographical latitude, and year. At the 2&sgr; level, no month-to-month variations in eruption frequency are found to be statistically significant. Examination of previously published month-to-month variations suggests that they, too, are not statistically significant. It is concluded that volcanism, at least averaged over large portions of the globe, is probably not periodic on a seasonal or annual time scale. ¿ American Geophysical Union 1989