1. Semi-Arid Climate, Steppe or Sahel Climate - Transitional between humid and desert climates. Semiarid conditions in subtropical and mid-latitude climates. Conditions similar to desert conditions. Temperature - Hot summers and cold winters. Summers are warm or hot; and winters mild, cool or cold depending where the place is located.
Precipitation - Precipitation is light 10 to 20 inches (25 to 50 cm.) but similar to the nearest humid climate. They are different from desert condition by their higher precipitation.
Vegetation - Grasslands and frees are virtually absent.
Soil - soils are brown chernozem and steppe
Land Use - risky for agriculture but these are the wheat, barley and sorghum areas of the world.
Location - Peripheral to deserts, especially in Argentina, northern Africa (the Sahel) and The Veld of South Africa, Australia, central and southern west Asia and the USSR and western United States (Utah, the Dakotas, Colorado, and Montana etc.). More well developed in the midlatitudes than in the subtropics.
2. Desert Climate - Very hot, evaporation exceeds precipitation on the average throughout the year. Associated with descending, diverging circulation of subtropical high pressure.
Temperature - Very hot. Average temperature over 64.4°F. Night temperatures are low and day time temperatures as high as over 100°F. Low humidity. Precipitation - unreliable rainfall, average precipitation is less than 10 inches a year. Very dry with only desert scrub and cactus.
Location - coastal Chile and Peru, Southwest Africa, Central Australia, Southwest United States, North Africa, Arabia, Iran, Pakistan and western India, Inner Asia, Central Asia and Southern Argentina.