That word would be dry.
Lanzarote, one of the Canary Islands, is considered to have a desert climate.
Yes, the word 'desert' 'desert' is a singular, common, concrete noun; a word for a dry, barren area of land, a word for a place.The word 'desert' is also a verb and an adjective.
that the desert probably had a wet climate at one time
The Sonoran Desert has a hot subtropical desert climate.
A desert island is not specific to any climate; however it is unlikely that a desert island would have a desert climate... because it's an island; a chunk of land in the middle of water. The desert in desert island means that no-one lives there... it's deserted. Islands in the Arctic and Antarctica could be considered deserts, but one usually connotes desert islands as having tropical climates.
No one can answer that question unless you specify a particular desert. Each has its own climate.
It is not always a tropical desert. The climate in the southern part if the desert is a dry, tropical climate, while the climate in the northern part of the desert is a dry, subtropical climate.
Desert climate
No, it is not. A desert is a biome. A climate would be the meteorological conditions, such as "hot and dry".
Describe the essential features of the climate of the Mojave Desert?
Tundra, believe me Tundra, believe me Tundra, believe me
Desert climate