How many months passed between the date of the lowest and highest temperatures in Guadalajara?
return Guadalajara ;return temperatures in  #1 ;return lowest of #2 ;return highest of #2 ;return when  was  #3 ;return when  was  #4 ;return difference of #5 and  #6 in  months
['select', 'project', 'aggregate', 'aggregate', 'project', 'project', 'arithmetic']