By sunrise in the morning the desert has lost all the daytime heating from the previous day and the current day's heating has not yet begun. Therefore, the time just before sunrise is generally the coolest time of the day in the desert.
Some deserts (hot deserts) are often hot during the day and much cooler at night. There is little humidity or cloud cover to hold the daytime heating.
the night is so much colder than the day
Deserts generally have few clouds and little humidity. These two factors would normally insulate the land from heating so much during the day as well as prevent the heat from radiating back into space at night. Since deserts lack these factors they heat up quickly during the day and cool quickly at night.
There are hot deserts and there are cold deserts so it is not always hot in a desert. The Antarctic Desert stays below the freezing mark even in summer. Some deserts are hot during the day but get quite chilly at night.
Deserts are hot during the day, when the sun is shining. Once the sun goes down, then the temperature drops. This is because desert surfaces receive a little more than twice the solar radiation received by humid regions and lose almost twice as much heat at night.
California deserts, such as the Mojave and Sonoran, can experience temperatures that drop to around 20°F (-6°C) at night during winter, while daytime temperatures can be much warmer. In contrast, Antarctica, classified as a cold desert, can see winter temperatures plummet to -40°F (-40°C) or lower, with record lows reaching nearly -128°F (-89°C). The extreme cold in Antarctica is due to its high elevation and location at the poles, making it significantly colder than California's deserts.
It is generally much cooler at night and most prey animals only emerge in the relative safety of darkness.
True. During ice ages, much of the Earth's water is stored in glaciers, reducing the availability of water for plant growth. This leads to a drier climate overall, promoting the expansion of deserts. Conversely, the colder temperatures and reduced precipitation can inhibit the growth of forests, making them less prevalent during ice ages.
Not necessarily. During the day, inland temperatures are usually much higher than they are near the coast, but at night, temperatures drop to colder temperatures inland, whilst seaside night time temperatures are milder.
Rainforests have high humidity and usually are covered with clouds. These two factors act as a blanket and help hold in daytime heating so the rainforest does not cool much at night. Deserts, on the other hand, have few clouds and usually have a very low humidity. Once the sun sets, the heat of the day begins to radiate quickly back into space,
No, deserts that are hot during the summer are much cooler in the winter, especially in cold winter deserts.
The climate in most deserts is quite hot and dry during much of the summer. However, during the monsoon season in the southwest United States from about June 15 - September 30 the humidity will frequently be higher than normal.