In this study a statistical analysis is done of the in- tensity, tendency, frequency and periodicity of the months where midsummer drought is recorded in the Tacubaya, D. F. meteorological station, during the period 1878-2004. Along the 121 years span of the study, a tendency to a decrease in the droug- ht is determined, as much in number of months as in volume; July and August being the
... [Show full abstract] preponde- rant canicular months. Likewise, there is a signi¯- cant increase of 42 % of summer precipitations along the period.