Answer:
The red square at the very top
Explanation:
The square at the very top represents the area in and around Greenland and Antarctica. The climate in these places is characterized by the coldness and dryness (in other words, hardly any precipitation).
We can also tell by the key down below. The colors under the category of "Polar" are usually coldest, and we can see from around the top red square that the color is greyish, indicating a tundra climate. Tundras are a type of biome that is known for barren lands and cold temperatures.
Thus, the answer is the red square at top.
