Dry

Dry climates are defined by little precipitation.

Annual temperatures of approximately 26 – 34°C. 

The precipitation threshold in millimetres (mm) is determined by multiplying the average annual temperature in Celsius by 20, then adding:

(a) 280 if 70% or more of the total precipitation is in the spring and summer months (April–September in the Northern Hemisphere, or October–March in the Southern), or
(b) 140 if 30%–70% of the total precipitation is received during the spring and summer, or
(c) 0 if less than 30% of the total precipitation is received during the spring and summer.

-    BW = Arid
-    BS = Semi-arid