The study area is classified according to Emberger's Climogram
in semiarid bioclimatic zone with cool winter and hot summer.
According to the De marton classification, Dezful is semi arid region and according to the Amberg climogram
, has a hot desert climate.
In some regions, it is not at all unusual for many years to pass without a single drop of rain falling, as shown by the climogram for Antofagasta.
Logically, the landscape varies greatly in such a large area (with hamadas, ergs, mountain areas, etc.), and there is great diversity of climate, as shown by the temperature and rainfall diagrams (climograms) for three different sites: Smara inland in the western Sahara, Agadez in the south next to the Sahel, and the Siwa Oasis in the east.
115 The global distribution of high mountain, and climograms
of eight mountain localities, representing different climatic situations (in the climogram
for Cuzco the year runs from July to June to make comparison with the sites in the northern hemisphere easier).
Precipitation and temperature climograms
for different years (left) and annual growths of Pinus oocarpa (right) that show the characteristic false rings formation in the most years as a response to a decrease in humidity conditions and an increase in temperature at the beginning of the growing season (right).