How can you use the calculation of the climate ratio to determine a climate type

The formula for climate ratio is p/Ep, where

how can you use the calculation of the climate ratio to determine a climate type

We can calculate the climate ratio to determine the climate type.

if the climate ratio is less than 0.4 the climate type would be arid,

if the climate ratio is between 0.4 to 0.8 climate ratio would be semirid,

if the climate ratio is between 0.8 to 1.2 climate type would be subhumid and

if the climate ratio is greater than 1.2 climate type would be humid.