Yes, deserts have winter. Some deserts can be very cold in winter even if summers are hot. Some deserts are quite mild in winter.
Rattlesnakes live in a variety of habitats including both hot subtropical deserts and cold winter deserts. There are a number of species spread over all the deserts of North America.
Most people who live in deserts live there because they like the desert. I live in a desert and love it.
Yes, many people live in the deserts of Africa.
Austria has no deserts.
Jackrabbits live in nearly all deserts - hot tropical, cold winter, etc. They do not live in extremely hot and dry deserts that lack vegetation nor are they found in extremely cold regions.
By 'they' I assume you mean people. Yes, millions of people around the world live in deserts, including the author of this answer.
Nomads are people who have no fixed residence but move from place to place within the deserts or winter-climated places. They mostly live in marginal areas.
Most people who live in deserts reside in towns and cities.
The least people live in the deserts in the South or on the mountains.
Millions of people around the world live in cities and towns located in deserts.
Yes, the desert has the winter season. In some deserts it is not nearly as pronounced as in others.
Nearly the entire state of Nevada is covered by deserts.