You headed to homeroom in a hefty jacket and a hat. A layman would just say it's the wild way of weather. A climatologist like George Taylor would say it's all about moisture in the air. The more water there is in the air, the smaller the daily temperature change.
Drier air means more variation.
Both are right. The nature and number of the factors that affect weather keep meteorologists guessing. Elevation, latitude, distance from the ocean, ocean temperature, moisture and air mass movement determine weather in a specific area, said Taylor, Oregon's climatologist. And with such mutable ingredients, it's no wonder that weather remains understandably unpredictable. Some factors have a greater effect on climate, while others affect weather more.