Which of the following is a sign that the weather may change for the worse?

A sudden drop in temperature is an important indicator that weather conditions may be about to change. This phenomenon often precedes the formation of storms, as it can signal the arrival of cooler air associated with a weather front moving into the area. When temperatures drop unexpectedly, particularly during a period of warm weather, it can mean that instability in the atmosphere is increasing, which might lead to developing inclement weather such as thunderstorms or rain.

Clear skies, on the other hand, typically suggest stable weather, while consistent humidity might indicate the presence of warm, moist air but doesn’t directly forecast worsening conditions. Steady winds can also signify stability, providing a sense of calm rather than change. Thus, while the other choices may reflect typical weather patterns, a sudden temperature drop serves as a critical warning sign for potential adverse weather changes.