The Relationship Between Tornadoes And Tornado Days

In the previous post I provided a monthly breakdown of tornadoes from 1950-2010.  Here, we will take a look at the relationship between the number of tornadoes and the number of tornado days. 

The chart below shows the number of tornadoes divided by the number of tornado days for each month, again from 1950-2010.  In other words, this is the average number of tornadoes that occur per tornado day.  It is important to note that this is NOT the same as the average number of tornadoes per month.  We are looking at how "efficient" the tornado days are at producing tornadoes.





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 As you can see, March and April tend to produce a relatively high number of tornadoes per tornado day with a decrease as we head into May and June.  Although June leads the way in number of tornadoes and number of tornado days, the RATIO is not as high.  The decrease continues in July and August with both months producing just under 1.5 tornadoes per tornado day.  After a modest increase in September, there is a rapid increase as we get into the fall months before another decline in the middle of winter.