It is true the weather is always changing, and sometimes the weather changes in ways we really don’t expect. For example, we minh have a warm, sunny day in the middle of winter, or a cold, windy day in the middle of summer. Recording the temperatures of each day helps us find the average temperature for the whole year. Doing this in many different parts of the world lets us find the average global temperature. When all temperatures are taken together , we would expect any ups and downs in the year to cancel each other out, and the average temperature to stay roughly the same from one year to the next. However, scientists have found that the temperature is not staying the same, and our planet is actually getting warmer each year. This is called global warming, and it is a major part of climate change.