What type of environment can temperatures drop to 15° below zero during a blizzard?

The American Midwest is characterized by its cold winters, where temperatures can indeed drop significantly during severe weather events like blizzards. This region experiences snow and extreme cold due to its geographical position, which often leads to frigid air masses moving down from Canada, resulting in temperature drops well below freezing, sometimes reaching as low as 15° below zero. This climate allows for the perfect conditions for blizzards to occur, where heavy snowfall and strong winds combine to create dangerously low temperatures.

In contrast, the other environments listed do not typically experience similar weather conditions. Deserts generally have arid climates with limited moisture, leading to much higher temperatures during the day and milder conditions at night, but they do not typically see blizzards or extreme cold. Coastal areas usually have more moderate temperatures due to the influence of oceans, which helps to keep the climate relatively mild year-round. Tropical rainforests feature warm, humid climates with temperatures remaining consistently high, often not dipping below freezing at all. Therefore, the American Midwest stands out as the correct answer, as it is the environment where severe winter weather, including blizzards and extreme cold, is prevalent.