Are clouds lower at high latitudes? Why?

This is my first time answering a question on the Internet. If there are any deficiencies, please feel free to enlighten me.

Before answering the original poster’s question, I need to explain why the clouds are high in some places and low in other places. The height of clouds mainly depends on the relative humidity (RH) of the air in a certain area at that time. The higher the RH, the lower the clouds. (Height of cloud = 125*Dewpoint_depression, see: "Meteorology Today", which should be available in many meteorology textbooks)

Now your question can be understood as: Comparison of relative humidity of air at high latitudes High? Why?

My answer is not necessarily, but the same can be said for Western Europe, especially Northwestern Europe.

Because air humidity is affected by many factors such as atmospheric circulation and ocean currents, it varies greatly with seasons in various regions. If you are interested, you can search for similar keywords "global relative humidity seasonal distribution map" and you may be able to find it. If you found it, congratulations. According to the relationship mentioned above, you can roughly estimate the cloud height in each region (of course, the dewpoint depression and relative humidity need to be converted, so the estimation does not need to be so strict).

The World Meteorological Organization (WMO) divides clouds into four categories: high, medium, low, and straight clouds according to their altitude. High clouds include cirrus, cirrocumulus, and cirrostratus. Depending on the latitude of Taiwan, the average height of high clouds is between six and eighteen kilometers above the ground. They are all ice crystal clouds. The middle clouds include two types of clouds: altostratus and altocumulus. The average height is between two and eight kilometers. Altocumulus are mostly mixed clouds, and altocumulus are mostly water droplets. Low clouds include stratus and stratus. Cumulus and nimbostratus clouds are three types of clouds. The cloud base height is less than two kilometers and can even almost touch the surface. Low clouds are mostly droplet clouds. Stratocumulus, stratocumulus and nimbostratus clouds may be mixed clouds. Vertical development clouds are more common in middle and high latitudes and in cold seasons, including cumulus and cumulonimbus. The cloud base height is within the height range of low clouds, but the tops often develop to high clouds. Therefore, the cloud body is often composed of water droplets and the towering top is composed of ice crystals. In addition to straight spreading clouds, other cloud groups often also overlap. For example, altostratus clouds may extend into the high cloud family range, and the cloud tops of thick nimbostratus clouds may also extend into the mid cloud family range. As for the height of each cloud family in high latitudes, the height of each cloud family in lower latitudes is lower.