Let’s take the Sahara for example, it’s a lot closer to the equator, yet at night temperatures fall to -4c (25f). Yet in the uk which is a lot further away from the equator, the night temperatures are around 15c (60f) during the summer. Why is this?
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Water as other commenters have said, is very important to even out temperatures to an extent. The other thing with deserts is the lack of moisture in the air or anything except for ground. There is nothing to absorb the warmth during the day and radiate it at night. You have the hot ground but after the sun goes, it gets no more heat and a breeze can take whatever remaining heat away. If you are in a forest or somewhere with cliffs, rocky outcrops, etc, they will retain the warmth and release it within a kind of localized blanket. If there is none of that and no water, there is nothing to retain the heat, so it gets cold. Stupidly cold.
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