Usually hot, scarcely rains.
Dry, humid, Lots of heat waves.
desert region
Every desert is different with different weather statistics. You need to give a specific location.
Yes the desert has a summer.
The Antarctic Desert is quite cold all year. The Patagonia Desert is cool or cold all year. The Gobi Desert may be hot in the summer but can turn bitterly cold in winter.
Each desert has its own weather data. Some have a rainy season in the summer, some in the winter and some have rain in both.
The summer weather is dry and pleasant. Temperature ranges are from 3 to 35 C in summer and minimums range from -20 to -35 C in winter.
The only desert with snow in the summer is Antarctica.
Every desert has its own weather statistics so you need to specify a particular desert. There are hot and cold deserts. The hottest temperature ever reliably measured in a hot desert was 134 degrees F. in Death Valley at Furnace Creek in 1913.
Every desert has its own weather statistics so there is no general answer to your question. It also makes a difference if a desert is in the northern or southern hemisphere. Some deserts have a rainy season in the summer, some have rainy seasons in the winter.
Each desert is different and has its own climate statistics. A "summer day" in Antarctica may actually warm up to about 10 degrees F. but can drop to nearly minus 140 degrees F. in winter. The Mojave, on the other hand, may have a daytime temperature of more than 130 degrees F and a nightime of 80 to 90 degrees. All the above statistics depend a great deal on the specific location in the desert.
monsoon
the hottest its been is 117ºF in st.george