Where on Earth would you expect to find the highest diurnal temperature, and why?
What will be an ideal response?
ANSWER: The largest diurnal range of temperature occurs on high deserts, where the air is fairly dry, often cloud-free, and there is little water vapor to radiate much infrared energy back to the surface. By day, clear summer skies allow the Sun's energy to quickly warm the ground which, in turn, warms the air above to a temperature often exceeding 38 degrees Celsius (100 degrees Fahrenheit). At night, the ground cools rapidly by radiating infrared energy to space, and the minimum temperature in these regions occasionally dips below 7 degrees Celsius (45 degrees Fahrenheit), thus giving an extremely high daily temperature range of more than 31 degrees Celsius (55 degrees Fahrenheit). A good example of a location with a large diurnal temperature range is the town of Winnemucca, Nevada, which is located at an elevation of 1310 m (4300 ft) above sea level. Here, in the dry, thin summer air, the average daily maximum temperature for July is 34 degrees Celsius (93 degrees Fahrenheit), but the average daily minimum temperature for July is only 11 degrees Celsius (52 degrees Fahrenheit). Winnemucca has a typical daily range in July of 23 degrees Celsius (41 degrees Fahrenheit)!?
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